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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.
For example, factory and aftermarket receivers using the Remington 700 footprint are produced with various types of action threads, all with a 26.99 mm (1 + 1 ⁄ 16 in) diameter, but with a pitch of either a 1.588 mm (16 TPI, Remington standard), 1.411 mm (18 TPI) or 1.270 mm (20 TPI, Savage standard).
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 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 first MK 23 production models were delivered to SOCOM on May 1, 1996. [20] HK commercially markets the MK 23 and derivatives of it, but not the complete SOCOM system. The suppressor is made by Knight's Armament Company, and was selected over the one HK originally included as part of its entry.
The HK P9 is a semi-automatic pistol from Heckler & Koch in 9×19mm Parabellum, .45 ACP, and 7.65×21mm Parabellum and the first to use a variation of H&K's roller delayed blowback system in a pistol format and polygonal rifling [1] now common in H&K designs.
GSG-5 A: With a 230 mm (9.1 in) barrel. GSG-5 L: Equipped with a 414 mm (16.3 in) barrel, designed to meet the legal requirements for minimum barrel length and overall length in several countries (including the United States). The longer barrel is covered with a barrel shroud (mock suppressor) for aesthetic purposes.
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".