HK MR762 Like its 5.56 mm counterpart, the MR762A1 is a direct descendent of the HK416/417 series, only in a semi-automatic rifle configuration developed for civilian users.

Using the HK-proprietary operating system, the MR762A1 is gas operated and uses a piston and a solid operating “pusher” rod in place of the common gas tube normally employed in AR15/M16/M4-style weapons. Pioneered by Heckler & Koch in the G36, HK416, and HK417; this method virtually eliminates malfunctions common to direct impingement gas systems since hot carbon fouling and waste gases do not enter the receiver area. The MR762A1 stays cleaner and heat transfer to the bolt and bolt carrier, and wear and tear on critical components is drastically reduced; the service life of all parts is increased substantially.

The MR762A1 uses a barrel produced by Heckler & Koch's famous cold hammer forging process. This manufacturing process uses the highest quality steel, producing a barrel that ensures superior accuracy, even after firing thousands of rounds.

The MR762A1 uses many of the assemblies and accessories originally developed for the HK416/417 series including adjustable buttstocks, ergonomic pistol grips, mechanical sights, and the HK free-floating four-quadrant rail system/handguard. This MIL-STD-1913 “Picatinny” type rail system allows all current accessories, sights, lights, and aimers used on M4/M16-type weapons to be fitted to the MR series. The HK rail system can be removed without special tools by the user and ensures 100% return to zero when reinstalled.

Ambidextrous operating controls are standard on the MR762A1, including the charging handle and an ambidextrous selector lever. The MR762A1 also uses the same 10- and 20-round translucent polymer box magazines made for the HK417.

• Length, maximum (stock extended) : 39.10″
• Length, minimum (stock retracted) : 35.94″
• Overall width: 3.23″
• Height : 8.36″
• Barrel Length: 16.6″
• Weight (without magazine): 9.60 lb
• Trigger pull: 7.64 lb
• Barrel Profile: 6 lands & grooves, right twist, 1 in 12 in
• Sight radius: 16.14″