Heckler & Koch MR762 A4 Semi-Auto 7.62x51mm AR Pistol

The Heckler & Koch MR762 A4 is a semi-automatic AR-style pistol chambered in 7.62x51mm NATO, built around a 13-inch cold hammer-forged threaded barrel and an adjustable gas piston operating system. Its black forged aluminum receiver includes a Picatinny rail and an M-LOK handguard, while the pistol buffer tube, ergonomic grip, and ambidextrous controls support comfortable, adaptable handling.

With a 20-round magazine and a birdcage flash hider, this long gun is configured for target and practice use. The cold hammer-forged, threaded barrel and stainless steel frame reflect HK's reputation for durability and engineering precision.

Key Features

Highlights

• 13 in cold hammer-forged threaded barrel chambered in 7.62x51mm NATO
• Semi-automatic operation with 20-round magazine capacity
• Adjustable gas piston operating system with birdcage flash hider
• Black forged aluminum receiver with Picatinny rail and M-LOK handguard
• Pistol buffer tube with ergonomic grip and ambidextrous controls

Materials & care

Wipe external surfaces with a lightly oiled cloth after use. Clean the cold hammer-forged threaded barrel and gas piston system regularly, and apply a thin coat of firearm oil to the stainless steel frame and forged aluminum receiver to prevent corrosion.

Compatibility

Accepts 7.62x51mm NATO ammunition and 20-round magazines designed for the MR762 A4. The M-LOK handguard is compatible with M-LOK accessories, and the Picatinny rail accepts standard Picatinny-mount optics and sights.

How to use

Load the 20-round magazine, insert it into the magazine well, and charge the firearm to chamber a round. The adjustable gas piston system can be tuned for reliable cycling, and the ambidextrous controls allow operation from either side.