HK MR556A1 and HK MR762A1 Rifles By HK USA

MR556A1/MR762A1 MR Series Rifles

The civilian semi-automatic HK MR556A1 and HK MR762A1 are direct descendents of the HK416/HK417 Series developed by Heckler & Koch for military and law enforcement use. The MR models, available in calibers 5.56 x 45 mm and 7.62 x 51 mm respectively, are major product improvements over conventional AR-type carbines and rifles. The semi-automatic MR Series rifles use the HK proprietary gas piston operating system, employing a piston and a solid operating “pusher” rod in place of the gas tube normally found in AR15/M16/M4-style firearms. 

This method of operation virtually eliminates malfunctions that are common to direct impingement gas systems since hot carbon fouling and waste gases do not enter the receiver area. This is the same key feature critical to the success of the HK416/HK417 rifles used by leading military and law enforcement customers.

The HK MR Series use many of the same assemblies and accessories originally developed for the HK416/417 including the HK free-floating four-quadrant rail system. This handguard 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 installed and removed without tools and returns to zero when reinstalled. MR Series rifles are produced in the USA from American and German-made components. Additionally, subassemblies like the MR556A1’s upper receiver will be fully interchangeable with other high quality AR-style firearms.

Like the HK416 and HK417, the MR Series rifles use barrels produced by Heckler & Koch’s famous cold hammer forging process. The highest quality steel is used in this manufacturing process, producing a long life barrel that provides superior performance with minimal degradation of accuracy and muzzle velocity after prolonged use. Projected availability on the HK MR556A1 rifle and the HK MR556A1 Upper Receiver Kit is late 2010/early 2011. The HK MR762A1 is in advanced development.

MR Series rifles use the same Free Floating Rail System as HK416/417, ensuring no rezeroing HK-proprietary gas piston operating system prevents propellent gases and carbon fouling from entering into the receiver area, increasing the reliability of the rifle. Same identical operating system used on the selective fire HK416 and HK417. Accessory HK pistol grips for a custom fit. MR rifles can also accommodate standard grips made for M16/M4/AR15 type weapons. 10 and 30-round steel magazines available. Essentially semi-automatic versions of the HK416/417 Series, the MRs are excellent choices as law enforcement patrol carbines.

German-made cold hammer forged barrel ensures long service life HK MR762A1 shown with HK flip-up front sight and diopter rear sight. A MR556A1 Upper Receiver Kit includes a complete barrel assembly, HK Free Floating Rail System handguard, bolt carrier assembly, buffer, and buffer spring allowing most AR-style rifles to be retrofitted to HK’s pusher rod system. Like the HK416/417, the MR556A1 and MR762A1 series match the performance and durability of their famous selective fire counterparts and are proven in all conditions...sand, mud, snow, and water. The MR556/MR762 series uses a wide assortment of accessories that fit the HK416 and other AR-type arms, including grips, buttstocks, sights and magazines.