Heckler & Koch MR762 A4, Semi-automatic, AR-Style Pistol, 308 Winchester/762NATO, 13 Cold Hammer Forged Threaded Barrel, 5/8X24 Thread Pitch, Anodized Finish, Black, M-LOK Free Float Handguard, Adjustable Gas Block, HK USA Enhanced Grip, Ambidextrous Controls, 20 Rounds, 1 Magazine 81001052 The latest update from HK-USA to the commercial version of the legendary HK417, the MR762 A4, showcases an improved example of "No Compromise" HK performance. Now available in a 13-inch pistol configuration.