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This kit includes a complete upper receiver/barrel assembly. This kit is only compatible with a MR762 lower . This closed system virtually eliminates the malfunctions that are common in direct-impingement gas systems, since hot carbon fouling and waste gasses are not propelled into the receiver area to operate the action. This is the same key feature critical to the success of the HK417 used by elite military and law enforcement customers. Upper will ship in HK Soft case. Kit will start shipping late Q4 2025

This kit includes a complete upper receiver/barrel assembly. This kit is only compatible with a MR762 lower . This closed system virtually eliminates the malfunctions that are common in direct-impingement gas systems, since hot carbon fouling and waste gasses are not propelled into the receiver area to operate the action. This is the same key feature critical to the success of the HK417 used by elite military and law enforcement customers. Upper will ship in HK Soft case. Kit will start shipping late Q4 2025

Produced by Midwest Industries the HK417/MR762 receiver rod is the ultimate tool for barrel nut installs or removal. It is also designed to be used for muzzle device installs and will not damage the index pin.

RAL8000 G28 buttstock kit for MR762 rifles.

45 Deg ambi safet kit for MR A4 rifles.

MR762 Cylindrical pin for stop pin

Pin for MR556 and MR762 hammer and trigger

Firing pin retainer spring for MR556 and MR762 rifles

Pivot pin complete for MR762

Backplate with QD cups for MR762 rifles

Originally designed for the US military’s SOPMOD rifle enhancement program, the KAC M4 Folding Front Sight is a low-profile backup sighting solution that is designed to be attached to the top rail of a rifle’s handguard. When stowed in the folded position, the M4’s sight base extends back to envelope the front sight leaf on the right and left side, helping to protect it from damage.

Detent for MR takdown pins

Trigger fuard pin for MR rifles

Castle nut wrench for MR556 and MR762 rifles.

Spring for MR takedown pins

Clamping pin for MR rifle ambi safety Requires two

Clamping sleeve for buffer locking pin