ACR 5.56

The Rubicon Adaptive Combat Rifle; officially abbreviated as the ACR 5.56 is an assault rifle developed and proposed for the future replacement of the MK16 and MK4 family of assault rifles. The ACR 5.56 uses the standard 5.56x45mm SDC round. 
== History ==
In the March 16th 2017, The Panamoan Army secretly proposed a future replacement for the MK16 and MK4 Rifle Family. While both of the previously mentioned weapons are very reliable, their iron sights, and carbon buildup was the only problem. Since the MK16/MK4 has highly elevated iron sights, they were permanently set for medium-long ranges, the ACR 5.56 solved the problem by having flip up sights instead, and retaining the gas operated system albeit improved. The MK4 also has a notorious gas system problem which is one major factor
Rubicon Corporation took the lead to create their own version of the ACR-223, the , by changing the standard caliber to 5.56x45mm SDC, and three different variations for diverse customisation to suit the combat situation. It also had a refurbished design, to making it more appealing to the eye.
The weapon has several features of other designs, the MK16 and the SMCR rifle platform. The key idea of the ACR 5.56's modular system, is that it will provide a wide variety of configurations within a matter of minutes. It is only available for the military market in 5.56x45mm SDC, 9x19mm Parabellum, .458 Borehound and 6.8mm Rubicon SPC. It can change calibers from 5.56 mm to 6.8 mm, .458 SOCOM, 9mm in minutes at the user level by changing the bolt head, barrel, and magazine.
The entire Armed Forces of the Panamoan Republic discovered the secret proposal, and got furious about the secret proposal for the replacement of the AR556 Platform. They quickly asked then why should they need a replacement; The Army explained that the iron sights were the only problem of the AR556 Family, and carbon buildup with continued use of direct impingement rifles.
In February 1, 2020 the ACR 5.56 STD Assault Rifle largely replaced the CYP-556 as the standard weapon of the Panamoan Army. While the Amphibious Panamoan Marine Corps kept their MK16A4 due to it's unrivalled performance, precision, accuracy, reliability and stopping power compared to most shorter barrelled 5.56mm SDS-68 Assault Rifles. 
Meanwhile, in November 16th 2021, the Amphibious Panamoan Marine Corps completely replaced their MK4A1s as their secondary issue weapon, particularly team leaders while certain vehicle personnel kept their short barrelled MK4 CQBR carbine before being replaced by it's carbine variant, the ACR 5.56 CQB and later superseded by the MK36C, while some designated marksmen were given the full sized variant, the ACR 5.56 SPR, specifically chambered for the heavily improved 5.56x45mm SDC SS987-Bulwark cartridge.
The earned a very good reputation in the battlefield and was later used until late 2028. The SPR variant was also been used as an Assault Rifle, in a similar manner to the MK16A4.
=== Black Pegasus ===
The ACR 5.56 in the STD configuration is utilised by the Panamoan Army and Panamoan Army Rangers as a standard service rifle in most operations, though it is replaced by the CQB variant in small, enclosed spaces in urban areas. Some Rubicon Security Service mercenaries are also armed with the STD variant, discreetly helping out the Panamoan Republic in the entire conflict.
== Design ==
Rubicon ACR 5.56 is a gas operated, selective fire next generation assault rifle with a modular design, even sharing the rifling twist rate of the MK16A4 for the STD and SPR variations. It has several features of other recent designs, such as the MK16 and the MK-17/18. The key idea of the ACR 5.56's modular system, is that it will provide a wide variety of configurations within a matter of minutes. It is only available for the military market in 5.56x45mm SDS-68, 9x19mm Parabellum, .458 Borehawk and 6.8mm Rubicon SPC. It can change calibers from 5.56mm to 6.8mm, .458 Borehawk, 9mm in minutes at the user level by changing the bolt head, barrel, and magazine.
To further strengthen the reliability and capability as a next generation assault rifle, the is outfitted with ice forged Nevium components, making the internal components last longer without needing to replace any. It's lightweight 9090 Titanium Alloy construction is "Neviunized", meaning that it has been fused with Nevium, similar to aluminized, thus, making it extremely durable, while it requires little maintenance and easy to field strip, or disassemble.
The ACR 5.56 STD is highly accurate, as it can take easy headshots at 450 to 600 meters without exceptional effort, and a 77% shot accuracy at 800 Meters, just eight percent less than the MK16A4's shot accuracy at the same distance. The ACR 5.56 CQB is technically less accurate, precise and deadly, that is compensated for handling and mobility in close range scenarios, while the ACR 5.56 SPR is the DMR long range variant, and essentially the accurised configuration of the ACR 5.56, notably provides equal precision and extreme accuracy as the MK16A4, due to them having the same rifling twist rate and barrel length.
It has multiple variants; the ACR 5.56 STD (Standard), ACR 5.56 SPR (Special Purpose Rifle), and the ACR 5.56 CQB (Close Quarters Barrel). The ACR 5.56 STD is the standard assault rifle variant with a 15/16 Inch rifled barrel with a rifling twist similar to the MK16A4, It has a foldable and adjustable buttstock, making it versatile in various combat scenarios. The ACR 5.56 CQB (Close Quarters Barrel) is a 12.5" Variant of the ACR 5.56, although having lower performance, accuracy, precision and stopping power compared to the STD, it is compensated for a more compact size for easy concealment, which earned the trust of vehicle crew members when using it indoors; As well as urban warfare. The SPR (Special Purpose Rifle) had long rifled 20" Inch Barrel, making it a full sized assault rifle, and the capability to engage at extreme distances, and it uses the hard hitting variant of the 5.56x45mm SDC, which is the SS978 Bulwark cartridge.
=== Specifications===
*Length: 900mm (Stock Fully Extended)
*Caliber: 5.56x45mm SDC
*Effective Range: 600 Meters (16" Barrel)
*Weight: 4.88 Pounds (16" Barrel)
== Attachments ==
=== Rail ===
*Red Dot Sight
*M2 Reflex Sight
*XM21 Reflex Sight
*C6E Reflex Sight
*Serizawa J7
*RIA Holographic Sight
*Z9 Scout
*CTS Scope
*ACOG Scope
=== Barrel ===
*Advanced Rifling
*Lightweight Suppressor
*Monolithic Suppressor
*Phantom Suppressor
*Muzzle Brake
===Underbarrel===
*MK203
*Angled Foregrip
*Foregrip
*Rubberized Foregrip
*Heavy Duty Foregrip
*Surefire M900 Flashlight Grip
*M910 Flashlight
=== Magazine ===
*Extended Mags
*50 Round Drum Magazine
*Dual Mags
*Quadstock Magazine
=== Ammunition ===
*.458 Borehound 10-Round Magazine
*9x19mm 30-Round Magazine
*RIA-12 Tracer Rounds
*RIA-7 Inciendary Rounds
*RIA-4 Hollow Points
=== Miscellaneous ===
*FMJ
*Stopping Power
*High Caliber
*Paragon Striker
== Remarks ==
=== APMC Remarks ===
* "The ACR 5.56 is really a next generation modular rifle, that can be modified with relative ease to suit the mission requirements, or user preference."
* This modular rifle unlike others. It can be a carbine, assault rifle, and marksman rifle in just a few conversions, you're good to go on the suited configuration to suit mission situations!"
=== Panamoan Army Remarks===
* "This thing really solved the carbon buildup of the AR556 family, and their elevated sights. This made me feel better when i slain multiple enemies of various species with ease."
*"The is truly a next generation modular rifle. It can be changed to the CQB variant for close combat operations, SPR for longer range firefights and the STD, the standard variation that bridges the gap between the two aforementioned variants."
* "The SPR variant is essentially a MK16A4 with a different chassis and mechanism, coupled with a foldable stock that makes it easy to conceal and use inside vehicles."
*"This assault rifle is so damn durable that mine was struck by a high frequency blade and it only sustained physical damage, and continued to function properly after i unjammed the weapon."
*"It's really a good weapon. Whether it is CQC or a wide scale military operation, it can bring death to our foes."
== Gallery ==
=== Black Pegasus ===
RIA ACR-556 FPV.png|First Person View
ACR-556 Sights.png|Iron Sights
ACR-556 Reloading.png|Reloading
ACR 5.56 Multiplayer Menu BPR.jpeg|The ACR 5.56 in the Multiplayer menu
ACR556 Rubicon.png|The ACR 5.56's Multiplayer Image
== Trivia ==
=== General ===
*In Panamoan Army field manuals it is officially known as the Adaptive Combat Rifle Weapon System.
* Because of it's popularity, civilian semi automatic versions (ACR 5.56-CV) are manufactured by Rubicon Corporation.
* The CQB version had a cyclic rate of fire between 830-920 RPM.
* The can be used as a DMR, particularly the SPR variation.
* It can actually mount flip up or fixed front sights, just like the MK-17/MK-18 IAR.
* The had ambidextrous controls, notably featured a double sided charging handle, so the user can either use the left or right handle when cocking, and making it user friendly for left handed shooters.
* It is highly recommended by Panamoan Army soldiers in replacing the MK4A1 as their standard issue, as the MK4 carbine's reliability is questionable, due to it's long barrel that gives higher pressure and fouling, as the carbine gas system is a quite short for it's barrel.
== Navigation ==
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