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It comes in two variants: the MP5 .22 LR Rifle, which resembles an MP5SD3 with a 16.1-inch barrel hidden by a faux "integral suppressor" barrel shroud; and the MP5 .22 LR Pistol, which resembles an MP5A1 or MP5A3 with an 8.5-inch barrel. Both variants use the "Tropical" handguard and the "0-1" trigger group.
It also cited less sensitivity to extreme temperatures for the 5.7×28mm and cited a greater potential risk of barrel erosion with the 4.6×30mm. [7] In addition, the group pointed out that 5.7×28mm is close to the 5.56×45mm NATO by its design and manufacture process, allowing it to be manufactured on existing production lines. [ 7 ]
The MG4 has a hammer-forged quick-change barrel that can be safely exchanged when hot without the need for protective gloves; the carrying handle serves as the barrel change grip. The barrel assembly weighs 1.80 kg (3.97 lb). To reduce the overall length of the weapon for transport, the butt stock can be folded to the left side of the receiver.
The Heckler & Koch G11 is a non-production prototype assault rifle developed from the late 1960s to the 1980s by Gesellschaft für Hülsenlose Gewehrsysteme (GSHG) (German for "Association for Caseless Rifle Systems"), a conglomeration of companies headed by firearm manufacturer Heckler & Koch (mechanical engineering and weapon design), Dynamit Nobel (propellant composition and projectile ...
The weapon has an integral suppressor mounted on the front of the upper receiver which wraps around the barrel. In order for the suppressor to be integrated, the AMB-17 employs a wider opening within its handguard as compared to the AM-17, along with the front of the upper receiver which also allows for an integrated handguard half-length MIL-STD/1913 Picatinny rail.
The M4 carbine barrel is 368 mm (14.5 in) and the XM8 barrel is 317 mm (12.5 in) but the rifles have the same overall length. Although a shorter barrel generally results in lower muzzle velocity, Polygonal rifling partially compensates for the loss of velocity from a shorter barrel. An electronic round counter was proposed for the XM8.
The rifle also features a removable and adjustable trigger unit, for further individual fitting of the rifle. The trigger pull can be modified and the whole assembly is removable from the pistol grip. The pistol grip is of a target-style with an adjustable palm shelf. The PSG1's official suppressor is from Brügger & Thomet (B and T). [3]
The barrel has very deeply cut rifling; this was done to purposely vent gas past the bullet, placing less gas pressure on the slide, a critical part of the VP70's direct blowback function. This also results in slightly reduced bullet velocity when compared to other pistols with similar, or even slightly shorter barrel length.