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The barrel has a chrome-lined bore with 6 right-hand grooves and a 178 mm (1:7 in) rifling twist rate that is optimized for use with heavier SS109 5.56×45mm NATO rounds. A barrel with a 305 mm (1:12 in) twist rate designed specifically to stabilize the lightweight M193 cartridge is also available. [ 2 ]
The new weapon's specifications were approved in February 1995 and in December the same year, a prototype production batch consisting of 11 Beryl rifles was produced. In 1997 the weapon had been successfully evaluated and adopted into service as the 5,56 mm karabinek szturmowy wz. 1996 ("assault carbine pattern 1996").
The barrel length is 330 mm. Unlike the Type 89, the Type 20 did not adopt the three round burst select fire, as it was deemed unnecessary. [ 18 ] The rifle is compatible with an underbarrel bayonet , and, according to a Ministry of Defense press conference, the rifle can be used with the Beretta GLX-160 grenade launcher. [ 5 ]
The chrome plated cold hammer forged barrel is free floating. The gun is quite ergonomic with its modular flip-up iron sight and five-position telescopic adjustable stock. The gun's length is 655 mm (25.8 in) when the stock is extended. It is made in 3 barrel length options, 368mm (14.5 in) 280mm (11 in) and 190 mm (7.5 in).
The M4's 14.5-in. barrel length reduces muzzle velocity to about 2900 ft/s. [151] This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20-inch barrel as the 5.56×45mm M855 is largely dependent upon high velocity in order to wound ...
The pistol accepts the same STANAG magazine that is used in the M-16, AR-15, and other NATO rifles chambered for 5.56×45mm. [3] The PLR-16's frame is constructed of reinforced polymer, making the pistol both durable and light-weight. The frame incorporates a Picatinny rail molded to the top of the receiver to accept various optical sights. [2]
The Ares Defense Shrike 5.56 is an air-cooled, dual-feed light machine gun/rifle for semi or full-auto configurations that fires the 5.56×45mm NATO cartridge. The Shrike 5.56 is sold as either as a complete weapon, or as an upper receiver "performance upgrade kit" to existing AR-15 and M16 -type service rifles and carbines.
In addition, the REC7 uses the new 6.8mm Remington SPC (6.8×43mm) cartridge, a round that is of roughly equivalent length to 5.56×45mm NATO ammunition, so it is compatible with a standard-size lower receiver currently in use by the United States military. The REC7 uses a short-stroke gas piston designed by Barrett. It rides above the barrel ...