The Franchi LF57 is an Italian pressed-metal submachine gun.
 A small number were made for the Italian Navy in the 1960s, but few others ordered it.
 The LF57 uses a recessed bolt head similar to the Beretta Model 12's as a method of reducing the weapon's length, although on the LF57 the bolt's mass is carried above the barrel rather than around it.
 This allows manufacture to be simplified to a degree.
 Most parts are made of stampings and pressings, and the two sides of the gun are one piece each, joined by a long seam.
 Dismantling the weapon is very simple, such as the barrel, which is held on by one single barrel nut.
 The tubular butt folds to the right side of the receiver, and the pistol grip is made entirely of steel.
 The sights are simple fixtures on the top of the barrel.
 Also it was rapidly known as the "Dead Squirrel" due to its low ammunition capacity.
A weapon with a telescoping bolt (also known as an overhung bolt) is one with a bolt which telescopes over, that is, wraps around and past, the breech end of the barrel.
 This feature reduces the required length of a weapon such as a submachine gun significantly, and it allows rifle designs to be balanced around the pistol grip in a way that gives "pointability" similar to a pistol's.
The Arsenal M23 submachine gun (Estonian: "Arsenali püstolkuulipilduja" ) (also known as Arsenal Tallinn) was an Estonian submachine gun from 1926 through 1935.
 These submachine guns were designed and produced in the Estonian military equipment factory "Arsenal" in Karjamaa, Tallinn, but production was not more than 600 units.
 The weapon was chambered for the 9x20 mm semi-rimmed Browning cartridge to be compatible with ammunition for the Browning FN M1903 pistol which had been adopted by the Estonian Army.
 It operated on the blowback system and was essentially similar to the MP18.1; having a wooden stock, slotted barrel jacket, and horizontal left side magazine feed.
 A uniquely slender 40 round single column box magazine led to frequent cartridge feeding problems; and cooling fins which were machined lengthwise along the barrel to promote cooling air flow when firing (similar to the Lewis machine gun), unnecessarily complicated production.
 It was used by the combat support units of the Border Guard, the Estonian Defence League and the Estonian Defence Forces.
 The Arsenal submachine gun was replaced in Estonian service by the Finnish Suomi KP/-31 submachine gun in 1938.
 The Estonian Army sold a few samples to Latvia and all of the remainder found their way to Republican forces during the Civil War in Spain.
The Akdal MKA 1919 is a gas operated, semi-automatic shotgun that resembles the M16 rifle and mimics the layout and placement of some of the controls.
 It was created by Turkish company Akdal Arms.
 The MKA 1919 uses a conventional gas-operated action which is located around the support tube that runs below the barrel.
 The return spring is also located around the same support tube which is concealed by an enlarged polymer handguard.
 The MKA 1919 barrel can be quickly removed from upper receiver.
 To charge the rifle, the charging handle on the receiver must be pulled.
 The upper receiver is manufactured from an aluminum alloy while the lower receiver, along with pistol grip and shoulder stock, is manufactured as one piece from impact-resistant polymer.
 Akdal MKA 1919 semi-automatic rifle has a 5-round detachable box magazine.
 It has a bolt release identical in location and function to the one on the M16.
 Manual safety also duplicates M16-style being located on the left side of the receiver above the pistol grip.
 Standard sights include a front post installed on the M16-style removable base and a detachable M16A2-style carrying handle with built-in diopter sight.
 On the upper receiver, an integral Picatinny rail exists which will accept detachable carrying handle or optional red-dot or other optical sight attachments.
The Uzi (Hebrew: עוזי‎ , officially cased as UZI) is a family of Israeli open-bolt, blowback-operated submachine guns. Smaller variants are considered to be machine pistols.
 The Uzi was one of the first weapons to use a telescoping bolt design which allows the magazine to be housed in the pistol grip for a shorter weapon.
The CZ Model 25 (properly, Sa 25 or Sa vz.
 48b/samopal vz.
 48b – "samopal vzor 48 výsadkový", "submachine gun model year 1948 para") was perhaps the best known of a series of Czechoslovak designed submachine guns introduced in 1948.
 There were four generally very similar submachine guns in this series: the Sa 23, Sa 24, Sa 25, and Sa 26.
 The primary designer was Jaroslav Holeček (1923–1977), chief engineer of the Česká zbrojovka Strakonice arms factory.
The A-91 bullpup assault rifle "(also known as A-91M)" was developed during the 1990s by KBP Instrument Design Bureau in Tula, as an offspring of the A-91 family of compact assault rifles described in the 9A-91 article.
 While the A-91 retains the basic gas-operated, rotating bolt action and a trigger unit design from 9A-91, it features a bullpup polymer housing, with an integral 40 mm single-shot grenade launcher mounted under the barrel.
 The earliest prototypes of the A-91 bullpup were fitted with the grenade launcher above the barrel, and with a front vertical foregrip; current models are fitted with the underbarrel launcher, which also serves as a forearm.
 The A-91 features a forward ejection system, initially developed in Tula by designers like Afanasiev during the early 1960s.
 In this system, the ejection port is located above the pistol grip, and points forward.
 Extracted cases are fed from bolt head through the short ejection tube to the ejection port, and fall out of the gun well clear of the shooter's face, even when firing from the left shoulder.
 As for now, the A-91 is made in small number and, probably, is used by some elite law enforcement units in Russia; it is also offered for export and domestic military and police sales.
This is a list of submachine guns.
 It includes assault rifles chambered for submachine gun or pistol cartridges, machine pistols, and personal defense weapons (PDWs), all of which are sometimes designated as submachine guns.
MCEM-2 (Machine Carbine Experimental Model 2) submachine gun was produced only in prototype form, but was one of the very first submachine guns to combine wrap-around bolt and magazine in pistol grip, features later copied in the Czechoslovak Sa vz.
 23, Israeli Uzi and a great number of other submachine guns.
 MCEM-2 was the second prototype in a line of experimental submachine guns, designed in Britain in 1944.
 It was envisioned as a possible replacement for the STEN submachine gun then in service.
 The MCEM-2 was developed by Jerzy Podsedkowski, a Polish constructor involved in work on Vis and Mors, who fled from occupied Poland to Britain.
 It is believed that prototypes of MCEM-2 were made before the end of WW2, and its derivatives MCEM-4 and MCEM-6 were tested soon after the war.
 The latter modifications differed mostly in adoption of the rate-reducing mechanism, incorporated into trigger unit; the rate of fire therefore was decreased from 1000 to more realistic 600 rounds per minute.
 Nevertheless, neither prototype was found suitable for adoption, and several years later British army adopted a more conventional submachine gun, the Sterling-Patchett.
The 9mm Steyr is a centerfire pistol cartridge originally developed for the Steyr M1912 military pistol.
 Adopted in 1912, this was the service ammunition for most branches of the military in Austria-Hungary during World War I and remained the service ammunition for Austria, Romania and Chile between the World Wars.
 Some MP 34 submachine guns were also issued in this caliber in addition to 9mm Mauser.
 When the Austrian Army was incorporated in the Wehrmacht in 1938 following the Anschluss, many M1912 pistols and MP 34 submachine guns were rebarrelled to 9×19mm Parabellum for standardization purposes.

Question: What are smaller variants of the Israeli submachine guns that copied the MCEM-2's combine wrap-around bolt and magazine in pistol grip considered to be?
Answer: machine pistols