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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.
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 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 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]
Three pistols went through a 30,000-round endurance test and maintained accuracy of 2.5 in (64 mm) at 25 meters; only the O-ring needed replacement after 20,000 rounds. The weapons worked in temperatures from -25 degrees Fahrenheit to 140 degrees Fahrenheit while exposed to mud, ice, and sand.
The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM.
This prevented addition of the bayonet. The HK911 did have the standard HK91 threaded barrel but this was covered by a pinned thread hider/cover. The HK911 eventually turned into the SR9 in 1990 which had the new 20-inch polygonal barrel. The first SR9s imported had wood grain stocks. The SR9 was also referred to as the "Orion".
The Heckler & Koch SL8 (Selbstladegewehr 1998) is a semi-automatic rifle manufactured by Heckler & Koch.It is a civilian version of the Heckler & Koch G36. [1]The rifle fires the .223 Remington or 5.56×45mm NATO cartridge and feeds from a 10-, 20- or 30-round detachable magazine (depending on the variant of the rifle).