Patent Publication Number: US-11047639-B2

Title: Method and grip module for firearm modification using a firing control unit

Description:
PRIORITY 
     This application is a continuation-in-part of U.S. patent application Ser. No. 15/892,397, filed on Feb. 8, 2018 in the name of the same inventor and entitled “Method and Apparatus for Providing a Grip Module able to House a Firing Control Unit,” which further claims the benefit of priority based upon U.S. Provisional Patent Application Ser. No. 62/456,490, filed on Feb. 8, 2017 in the name of the same inventor and entitled “Firearm Grip Module,” and U.S. Provisional Patent Application Ser. No. 62/456,499, filed on Feb. 8, 2017 in the name of the same inventor and entitled “Firearm Grip Module Conversion,” and this application is also a continuation-in-part of U.S. patent application Ser. No. 15/892,410, filed on Feb. 9, 2018 in the name of the same inventor and entitled “Method and Grip Module for Firearm Modification Using a Firing Control Unit,” all of which are incorporated herein by reference in their entirety. 
    
    
     FIELD 
     The embodiments of present invention relate to firearms. More specifically, the present invention relates to receivers of guns. 
     BACKGROUND 
     A conventional gun, such as a rifle and/or pistol containing a striker is able to strike the casing of the ammunition to ignite the primer and discharge the projectile. For example, when a trigger of pistol is pulled, the sear releases the striker, allowing the striker spring to displace the striker forward so that the striker strikes the ammunition to launch a bullet. Typically, the guns include different types of firearms which include, but not limited to, semiautomatic rifles (i.e., Ruger SR-556, Smith &amp; Wesson M&amp;P15-22, CMMG Mk47 Mutant), bullpup firearms (i.e., Kel-Tec KSG, Kel-Tec RDB, M17S556), and/or machine guns (i.e., TEC 9, NP9, Honey Badger PDW). 
     A problem associated with the conventional guns is that the components of the different types of the guns are not interchangeable. 
     SUMMARY 
     A bullpup-shaped rifle (“BSR”) or assault rifle (“AR”) able to expel a bullet is disclosed. In some embodiments, the BSR includes a firing control unit (“FCU”), grip module, bullpup rear attachment, and bolt and barrel assembly. The FCU is a serialized trigger mechanism capable of initiating launching a directional object when a trigger of the FCU is pulled. The grip module which contains a grip, FCU housing, and rear stabilizing connector, wherein the FCU housing is configured to house a removable FCU. The bullpup rear attachment which is coupled to the rear stabilizing connector for enhancing stability is configured to have a magazine port for receiving a magazine. The bolt and barrel assembly which is situated above the magazine port inside of the bullpup rear attachment behind the FCU facilitates the firing of the object. In one aspect, the BSR also includes an upper receiver configured to couple to the grip module for enclosing the FCU and the bolt and barrel assembly between the upper receiver and the grip module. 
     Additional features and benefits of the exemplary embodiment(s) of the present invention will become apparent from the detailed description, figures and claims set forth below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiment(s) of the present invention will be understood more fully from the detailed description given below and from the accompanying drawings of various embodiments of the invention, which, however, should not be taken to limit the invention to the specific embodiments, but are for explanation and understanding only. 
         FIG. 1  is a diagram illustrating a grip module and FCU in accordance with one embodiment of the present invention; 
         FIGS. 2A-B  are diagrams illustrating rear attachments to the grip module in accordance with one embodiment of the present invention; 
         FIG. 3  is a diagram illustrating a conversion process using the same FCU with different bodies in accordance with one embodiment of the present invention; 
         FIG. 4  is a diagram illustrating a bullpup-shaped rifle (“BSR”) using the grip module in accordance with one embodiment of the present invention; 
         FIG. 5  is a diagram illustrating a carbine-like rifle using the grip module in accordance with one embodiment of the present invention; 
         FIG. 6  is a diagram illustrating a grip module capable of housing multiple FCUs in accordance with one embodiment of the present invention; 
         FIG. 7  is a diagram illustrating a modified assembly having a grip module and upper receiver in accordance with one embodiment of the present invention; 
         FIG. 8  is a diagram illustrating cut-open illustrations of guns showing internal components in accordance with one embodiment of the present invention; and 
         FIGS. 9-10  are diagrams illustrating exemplary firearms capable of using grip modules in accordance with one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiment(s) of the present invention is described herein in the context of a method, system and apparatus of modifying a firearm using a grip module and FCU. 
     Those of ordinary skills in the art will realize that the following detailed description of the exemplary embodiment(s) is illustrative only and is not intended to be in any way limiting. Other embodiments will readily suggest themselves to such skilled persons having the benefit of this disclosure. Reference will now be made in detail to implementations of the exemplary embodiment(s) as illustrated in the accompanying drawings. The same reference indicators will be used throughout the drawings and the following detailed description to refer to the same or like parts. 
     References to “one embodiment,” “an embodiment,” “example embodiment,” “various embodiments,” “exemplary embodiment,” “one aspect,” “an aspect,” “exemplary aspect,” “various aspects,” etc., indicate that the embodiment(s) of the invention so described may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Further, repeated use of the phrase “in one embodiment” does not necessarily refer to the same embodiment, although it may. 
     In the interest of clarity, not all of the routine features of the implementations described herein are shown and described. It will, of course, be understood that in the development of any such actual implementation, numerous implementation-specific decisions may be made in order to achieve the developer&#39;s specific goals, such as compliance with application- and business-related constraints, and that these specific goals will vary from one implementation to another and from one developer to another. Moreover, it will be understood that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of engineering for those of ordinary skills in the art having the benefit of this disclosure. 
     Various embodiments of the present invention illustrated in the drawings may not be drawn to scale. Rather, the dimensions of the various features may be expanded or reduced for clarity. In addition, some of the drawings may be simplified for clarity. Thus, the drawings may not depict all of the components of a given apparatus (e.g., device) or method. 
     As used herein, the singular forms of article “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Also, the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term “and/or” includes any and all combinations of one or more of the associated listed items. 
     One embodiment of the presently claimed invention discloses a bullpup-shaped rifle or assault rifle (“AR”) using the grip module. The bullpup-shaped rifle (“BSR”) or assault rifle (“AR”) is able to expel an object such as a bullet. In some embodiments, the BSR includes a firing control unit (“FCU”), grip module, bullpup rear attachment, and bolt and barrel assembly. The FCU is a serialized trigger mechanism capable of initiating launching a directional object when a trigger of the FCU is pulled. The grip module which contains a grip, FCU housing, and rear stabilizing connector, wherein the FCU housing is configured to house a removable FCU. The bullpup rear attachment which is coupled to the rear stabilizing connector for enhancing stability is configured to have a magazine port for receiving a magazine. The bolt and barrel assembly which is situated above the magazine port inside of the bullpup rear attachment behind the FCU facilitates the firing of the object. In one aspect, the BSR also includes an upper receiver configured to couple to the grip module for enclosing the FCU and the bolt and barrel assembly between the upper receiver and the grip module. 
       FIG. 1  is a diagram  100  illustrating a grip module and FCU in accordance with one embodiment of the present invention. Diagram  100 , in some embodiments, includes a grip module  102 , FCU  108 , internal components  104 , and upper receiver  106 . Internal components  104  includes, but not limited to, a slide, a barrel, a barrel block, a bolt, and/or return spring. Grip module  102 , in one example, can also be referred to as bottom receiver or lower receiver. It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagram  100 . 
     Grip module  102 , in some embodiments, includes a handle or grip  110 , an FCU housing  128 , a rear stabilizing connector  112 , and a trunnion  114 . Grip  110  can be resized to better accommodate smaller or larger hands of a user. In one example, grip  110  is configured to be hollow capable of receiving a magazine of ammunition. It should be noted that grip  110  can be designed to a grip similar to a particular model of firearm. FCU housing  128 , in some embodiments, is configured to FCU or FCU module  108 . In an alternative embodiment, grip module  102  is configured to accept any one or more of the upper components of the original firearm (such as the barrel, barrel block, bolt, strike, and/or slide) in addition to FCU module  108 . For the forgoing discussion, the terms “FCU” and “FCU module” are referring similar component(s) and they can be used interchangeably. 
     Rear stabilizing connector  112 , in some embodiments, is configured to accommodate an arm brace, buttstock, or cheek rest attachment. For example, grip module  102  can be designed as a Short Barrel Rifle (“SBR”), which would convert a pistol or rifle to an SBR or act as an alternative grip module for an existing SBR. In one aspect, the rear attachment, such as an arm brace, cheek rest, or buttstock, is configured to be optionally added or removed from rear stabilizing connector  112 . In another aspect, the rear attachment such as buttstock could be designed to be stationary or collapsing, and could also be designed to incorporate a spare magazine holster. A function of the rear attachment such as an arm brace or buttstock is to provide stability of the modified assembly during a firing operation. 
     Upper receiver  106 , in some embodiments, is configured to take the form of an upper receiver with the option of a mounting point, a dust cover, which could use the upper components from the original firearm or new components, a trunnion, or a stationary rail. For example, upper receiver  106  contains scope latches  116 - 118  which will be used to secure a scope for aiming. Upper receiver  106 , in one example, includes an opening for the movement of a bolt and bolt carrier associated with firearm cocking as indicated by numeral  120 . Upper receiver  106  further includes a serial displaying window which will be used to show the original serial number of FCU when FCU is inserted into FCU housing  128 . 
     An advantage of employing grip module is that it provides accessory options, capability enhancements, customization options, and other options not available on the otherwise available firearms. 
       FIG. 2A  illustrates an arm brace  206  and a magazine holster cheek rest  202  capable of being attached to the rear stabilizing connector in accordance with one embodiment of the present invention. Arm brace  206 , in one example, can be connected to the rear stabilizing connector of the grip module for providing stability. A strip  210  which can be part of arm brace  206  is used to provide additional stability support. Cheek rest  202 , in some embodiments, can be a magazine holster for carrying additional ammunition. Alternatively, cheek rest  202  can be a solid piece for cheek resting. It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagrams  202  or  206 . 
       FIG. 2B  illustrates diagrams  220 - 224  showing rear attachments capable of being attached to the grip module in accordance with one embodiment of the present invention. Diagram  220  illustrates a buttstock  252  attached to grip module  102  or lower receiver. In one aspect, buttstock  252  is removable but it is stationary when it is connected. Diagram  222  shows an alternative type of buttstock which can be similar to buttstock  252 . Diagram  224  illustrates a modified assembly containing barrel  266 , grip module  102 , and buttstock  262 . In one aspect, buttstock  262  is collapsible by holding buttstock  262  in 180 degrees. It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagrams  220 - 224 . 
       FIG. 3  is a diagram  300  illustrating a conversion process using the same FCU with different bodies in accordance with one embodiment of the present invention. Diagram  300  includes a pistol  302  and a modified assembly  304  which is configured to resemble as an MP9 (maschinenpistol 9 mm) like submachine gun. In some embodiments, modified assembly  304  is configured to incorporate usage of FCU  320  which is the same or substantially the same as FCU  310  used in pistol  302 . It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagram  300 . 
     Pistol  302 , in some embodiments, includes FCU  310 , pistol receiver  312 , magazine  316 , and internal components  314  which includes a slide, barrel, and return spring. Pistol  302 , in one example, can be the Glock model 17 which can be easily disassembled to separate FCU  310  from pistol  302 . FCU  310 , in one embodiment, can be refitted into modified assembly  304  as indicated by numeral  318 . 
     Modified assembly  304 , in one embodiment, includes a grip module  102 , magazine  326 , internal components  336 , upper receiver  330 , and FCU  320  which is similar or the same as FCU  310 . Internal components  336  includes, but not limited to, a slide, a barrel, a barrel block, a bolt, and/or return spring. Grip module includes a rear stabilizing connector which is used to couple to a buttstock  328 . It should be noted that when modified assembly  304  is assembled with FCU  320 , the assembly should resemble a semiautomatic machine gun such as MP9. 
     An advantage of using a grip module is that it facilitates a conversion from a pistol like firearm to a rifle or machine gun like firearm using similar FCU modules. 
       FIG. 4  is a diagram  400  illustrating a bullpup-shaped rifle (“BSR”) using the grip module in accordance with one embodiment of the present invention. Diagram  400  includes a grip module  402 , FCU  108 , upper receiver  106 , bolt and barrel assembly  408 , and barrel  406 . Grip module  402 , in some embodiments, includes a BSR buttstock  422 . It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagram  400 . 
     Grip module  402 , in one aspect, includes a grip or handle  410 , FCU housing or cavity for housing FCU  108 , trunnion  414 , and rear stabilizing connector  412 . Grip module  402 , in some embodiments, is structured to include at least a portion of lower receiver for a pistol, Small Barrel Rifle (“SBR”), and/or self-loading semiautomatic rifle. It should be noted that the grip module such as grip module  402  is designed to accept an FCU module such as FCU  108  in such a way that the ammunition loading port(s) and/or ammunition type(s) can be deviated from the originally designated port(s) associated with the FCU when it is manufactured. 
     An SBR, or short barrel rifle is a type of rifle with relatively short barrel(s). For example, an SBR may have a barrel shorter than 16″ or smaller than 26″ overall length of SBR. Another type of firearm that is similar to SBR is bullpup rifle or Short Barrel Shotgun both of which have relatively short barrels. 
     The BSR, in one aspect, includes an FCU  108 , grip module  402 , bullpup rear attachment  422 , and bolt and barrel assembly  408 , and is capable of firing an object such as a bullet. FCU  108  is configured to be a serialized trigger mechanism capable of initiating launching a directional object when a trigger is pulled. Grip module  402  further contains a grip  410 , FCU housing, and rear stabilizing connector  412 , wherein the FCU housing is configured to house a removable FCU such as FCU  108 . 
     Bullpup rear attachment  422 , coupled to the rear stabilizing connector, is used to enhance overall stability of the BSR. In one example, bullpup rear attachment  422  is configured to have a magazine port  418  for receiving a magazine. The magazine, in one example, is a vessel or receptacle for housing ammunition. Bolt and barrel assembly  408  is situated above magazine port  418  inside attachment  422  for facilitating firing of the object. In one example, bolt and barrel assembly  408  is physically situated behind FCU  108 . 
     The BSR further includes an upper receiver configured to couple to grip module  402  capable of enclosing FCU  108  as well as assembly  408  between upper receiver  106  and grip module  402 . Upper receiver  106  includes scope latches  106  capable of receiving a scope for target aiming and a charging handle  426 . FCU  108  contains an original serial number for identifying FCU and/or firearm. Grip module  402  contains a serial number window which is located in such a way that when FCU  108  is inserted in the FCU housing of grip module  402 , the original serial number of FCU  108  displays through the serial number window. Grip module  402 , in some embodiments, can be fabricated by one of aluminum, zinc, alloy, composite materials, and pressure resistance plastics. Grip module  402  includes a trunnion  414 , barrel block, or receiver which are used to receive or attach a barrel  406  coupling to grip module  402 . 
     An advantage of using grip module  402  is that it enable to a user to convert from a pistol to a semiautomatic machine gun or rifle or vice versa. 
       FIG. 5  is a diagram  500  illustrating a carbine-like rifle using a grip module in accordance with one embodiment of the present invention. Diagram  500  includes grip module  502  and buttstock  522 . In one aspect, bolt and barrel assembly  408  is situated in the vicinity of FCU  108 . A carbine rifle is a relatively long gun with a medium range barrel which is generally shorter than a rifle. A carbine rifle, such as M4 carbine, is a version of rifle capable of firing rifle ammunition as well as pistol ammunition. It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more components (or elements) were added to or removed from diagram  500   
     In operation, grip module or lower receiver  502  is configured to house FCU  108  as well as bolt and barrel assembly  408 . Barrel  406  can be coupled to bolt &amp; barrel assembly  406  using either a bolt block, lower receiver, and/or assembly  408 . Upper receiver, which can perform a function of dusk cover and/or stationary rail, is coupled to lower receiver  502 . A benefit of using the embodiment of grip module or lower receiver  502  is that it facilitates converting a hand gun to a carbine-like rifle using some components of the hand gun such as FCU. 
       FIG. 6  is a diagram  600  illustrating a grip module capable of housing one or more FCUs in accordance with one embodiment of the present invention. Diagram  600  illustrates a semiautomatic firearm assembly able to expel ammunition. The firearm assembly includes FCU  108 , grip module  602 , upper receiver, and bullpup rear attachment. FCU  108 , in some embodiments, controls firing sequence. Grip module  602  contains a grip, first FCU housing or primary FCU location referenced by numeral  604 , second FCU housing or secondary FCU location referenced by numeral  606 , third FCU housing or tertiary FCU location referenced by numeral  608 , and rear stabilizing connector. The rear stabilizing connector is used to couple to a bullpup rear attachment or buttstock. 
     First FCU housing or primary FCU location is situated above the trigger, and second FCU housing or secondary FCU location is situated in behind of the trigger. It should be noted that barrel of a gun is referred as the front of gun and buttstock is referred to as the back of the gun. Also, the direct against the gravity is referred to as up or above and the direct with the gravity is referred to as low or below. Third FCU housing or tertiary FCU location is situated in the front of the trigger, wherein the first, second, and third FCU housings are capable of housing one or more FCU modules which can be used to facilitate launching one or more types of ammunition substantially the same time. 
     In some embodiments, the primary FCU location or primary FCU module location is configured to be above the trigger, and the secondary FCU location or FCU module location is situated to be forward of the trigger. The tertiary FCU module location or FCU location is rearward of the trigger as indicated by numeral  608 . In some aspects, grip module  602  is designed to accept an FCU module at any two of the primary, secondary, and tertiary FCU module locations. Grip module  602 , in one embodiment, utilizes a single external trigger to actuate one or more FCUs situated in the FCU module locations referenced by numbers  604 - 608 . Grip module  602 , in an alternative embodiment, utilizes a single external trigger to actuate three FCUs situated in the FCU module locations referenced by numbers  604 - 608 . 
     Alternatively, different FCU can be configured to control firing different caliber of bullets. For example, the first FCU may be used to fire 50 caliber (“50 cal”) while the second FUC may be used to control filing of 5.56 millimeters (“mm”). It should be noted that Caliber (Cal) is the diameter of a firearm&#39;s bore. For example, “50 cal” is a .50 inch caliber, or a half-inch in diameter. Also, 9 mm, 5.56 mm, 7.62 mm are usually referring to the diameter of the bore and bullet that goes through it. 
     An advantage of using more than one FCU modules or using one FCU module control multiple types of ammunition is to allow a user to launch a grenade, missile, and/or drone while keeping firing of bullets. 
       FIG. 7  is a diagram  700  illustrating a modified assembly having a grip module and upper receiver in accordance with one embodiment of the present invention. Diagram  700 , in one embodiment, is similar to diagram  600  except that the upper receiver and lower receiver (or grip module  402 ) are in closed formation. In one aspect, the modified assembly can be used to convert a pistol to a bullpup-like rifle using some of the pistol&#39;s components such as the FCU or vice versa. 
       FIG. 8  is a diagram illustrating cut-open illustrations of an MP9 like gun  800  and bullpup rifle with grenade launcher (or semiautomatic machine gun)  820  showing internal components in accordance with one embodiment of the present invention. MP9 like gun  800  illustrates a bolt  802  and a barrel block  804  wherein barrel block  804  is used to anchor a barrel, not shown in  FIG. 8 . In some embodiments, the grip module such as grip module  806  is designed to accept variable sized barrels for different sized ammunition. Grip module  806  containing a grip is capable of receiving a magazine  808  to facilitate burst firing of bullets. 
     Machine gun  820  includes a gun portion  838  and a grenade launcher  836  wherein gun portion  838  includes a grip module  832 , barrel  824 , and bullet(s)  828 . Grenade launcher  826  includes grenade(s)  826  and launcher barrel  822 . In some aspects, FCU(s)  830  can be in gun portion  838 , launcher  836 , or both depending on the configuration of FCU(s). For example, gun  820  includes a bullpup rifle portion  838  containing barrel  824  and grenade launcher  838  with a barrel  822 . It should be noted that grenade launcher  838  can launch grenades, drones, missiles, and/or cannons. 
     Grip module  832 , in one example, is designed to accept barrels  822 - 824  for various sized ammunition such as grenade  826  and bullet  828 . In one embodiment, grip module  832  accepts a barrel at the Primary, Secondary, or Tertiary FCU module location as well as two or three barrels simultaneously. Alternatively, grip module  806  or  832  is designed to convert the slide or bolt carrier of the original firearm into a bolt carrier or slide. Grip module  832  or  806  is designed to use the FCU module as a triggering device that activates a firing apparatus. It should be noted that grip module such as grip module  832  is capable of permitting the FCU module such as FCU  830  to activate one or more types of ammunition substantially concurrent. 
     An advantage of using the grip module is to increase the versatility of firearm using a portion of existing components such as FCU(s). 
     In some embodiments, gun  820  includes a semiautomatic firearm assembly able to expel or fire bullets and/or grenades. Gun  820  includes an FCU module  830  and grip module  832 . FCU module  830  is configured to be a serialized trigger mechanism capable of initiating launching one or more directional objects such as bullets and grenade when a trigger is pulled. FCU module  830 , in one embodiment, includes a single FCU configured to control both bullet and grenade firings. Alternatively, FCU module  830  includes two FCUs wherein one FCU is used to fire bullets  828  while another FCU is used to launch grenades  826 . It should be noted that additional FCUs may be used to control additional types of ammunition. 
     Gun  820  further includes an upper receiver configured to couple to the grip module such as grip module  832  for enclosing the FCU, bolt and barrel assembly between the upper receiver and the grip module. Note that the FCU situated in the grip module is able to select one of multiple types of ammunition. In some embodiments, the FCU situated in the first FCU housing is actuated via a triggering system for firing a bullet while the FCU situated in the second FCU housing is actuated via the triggering system for launching a grenade. 
       FIGS. 9-10  are diagrams  900 - 1002  illustrating exemplary firearms capable of using grip modules in accordance with one embodiment of the present invention. It should be noted that the illustrated firearms are self-loading rifles or machine guns. Self-loading or automatic loading semiautomatic firearm can be referred to as automatic loading of ammunition in response to the prior firing. It should be noted that the underlying concept of the exemplary embodiment(s) of the present invention would not change if one or more guns (or elements) were added to or removed from diagrams  900 - 1002 . 
     Diagram  900  illustrate a bullpup or bullpup like rifle capable of firing ammunition continuously using self-loading mechanism. Embodiments of grip module can be employed to convert between a hand gun and a bullpup like rifle using certain shared components such as FCU module(s). A benefit of using the embodiment(s) of the grip module is to enable a user to interchange certain components such FCU module(s) between pistols, rifles, and machine guns. 
     Diagram  901  illustrate a small barrel rifle (“SBR”) or SBR like rifle capable of firing ammunition continuously using self-loading mechanism. Embodiments of grip module can be employed to convert between a hand gun and a SBR like rifle using certain shared components such as FCU module(s). A benefit of using the embodiment(s) of the grip module is to enable a user to interchange certain components such FCU module(s) between pistols, rifles, and machine guns. 
     Diagram  902  illustrate an assault rifle (“AR”) such as AR 15 like rifle capable of firing ammunition continuously using self-loading mechanism. Embodiments of grip module can be employed to convert between a hand gun and an AR 15 like rifle using certain shared components such as FCU module(s). A benefit of using the embodiment(s) of the grip module is to enable a user to interchange certain components such FCU module(s) between pistols, rifles, and machine guns. 
     Diagram  1000  illustrate a carbine rifle or carbine like rifle capable of firing ammunition continuously using self-loading mechanism. Embodiments of grip module can be employed to convert between a hand gun and a carbine like rifle using certain shared components such as FCU module(s). A benefit of using the embodiment(s) of the grip module is to enable a user to interchange certain components such FCU module(s) between pistols, rifles, and machine guns. 
     Diagram  1002  illustrate MP9 or MP9 like gun capable of firing ammunition continuously using self-loading mechanism. Embodiments of grip module can be employed to convert between a hand gun and an MP9 like rifle using certain shared components such as FCU module(s). A benefit of using the embodiment(s) of the grip module is to enable a user to interchange certain components such FCU module(s) between pistols, rifles, and machine guns. 
     While particular embodiments of the present invention have been shown and described, it will be obvious to those of ordinary skills in the art that based upon the teachings herein, changes and modifications may be made without departing from this exemplary embodiment(s) of the present invention and its broader aspects. Therefore, the appended claims are intended to encompass within their scope all such changes and modifications as are within the true spirit and scope of this exemplary embodiment(s) of the present invention.