HK MR556 A4 5.56x45mm NATO 11" Threaded Pistol 10-Round Black

The HK MR556 A4 is a semi-automatic AR-platform pistol chambered in 5.56x45mm NATO and 223 Remington, built on Heckler and Koch's HK416 design. It uses a short-stroke gas piston system, which keeps hot carbon fouling out of the action compared with direct-impingement ARs. A two-position adjustable gas block allows the operator to tune the action for suppressed or unsuppressed use.

The pistol has an 11-inch threaded barrel and an overall length of 26.5 inches, and weighs 6.61 pounds. It ships with a 10-round capacity, a polymer construction, an anodized black finish, and no iron sights. Fully ambidextrous controls and a slimline M-Lok handguard are included, along with an ergonomic grip, a tensioning buffer, a single-point QD end plate, and a winter trigger guard.

• Action: Semi-Auto, short-stroke gas piston
• Caliber: 5.56x45mm NATO, 223 Remington
• Barrel Length: 11 in, threaded
• Overall Length: 26.5 in
• Weight: 6.61 lbs
• Capacity: 10 rounds
• Material: Polymer
• Finish: Anodized black