Ships to FFL
Smith & Wesson
★ 4.8 (38)
$540.49
Capacity: 30 | Barrel Length: 4.35
The Heckler & Koch MR556 A4 pistol is the commercial semi-automatic counterpart to the HK416, combining HK's short-stroke gas piston operating system with a compact 11-inch barrel. The piston system limits hot carbon fouling in the action, helping reduce maintenance and wear during extended use. An adjustable gas regulator supports tuning for suppressed or unsuppressed operation, while the free-float M-LOK handguard provides a slim, adaptable mounting platform. Fully ambidextrous controls and an HK USA enhanced grip improve handling for a wide range of users. Chambered for .223 Remington and 5.56 NATO, the MR556 A4 accepts a 30-round magazine and includes one magazine.
Key features
- Short-stroke gas piston system helps keep hot carbon fouling out of the action
- Adjustable gas regulator supports suppressed and unsuppressed operation
- 11-inch threaded barrel chambered for .223 Remington and 5.56 NATO
- Free-float M-LOK handguard provides flexible accessory mounting
- Fully ambidextrous controls support left- and right-handed operation
- Optic-ready top rail accommodates a wide range of aiming systems
The HK MR556 A4 delivers compact piston-driven performance with ambidextrous controls and adaptable M-LOK compatibility.
Heckler & Koch MR556 A4 Piston M-LOK .223 Remington 5.56: quick facts
- What caliber is the Heckler & Koch MR556 A4 Piston M-LOK .223 Remington 5.56?
- It is chambered in .223 Remington, 5.56 NATO.
- How many rounds does it hold?
- 30+1 rounds; magazines included: 1.
- How big and heavy is it?
- Barrel length 11 inches, overall length 29.5 inches, weight 6.9 pounds.
- What kind of action does it use?
- Semi-Automatic.
- Is it optic ready or threaded?
- Optic ready: Yes; threaded barrel: Yes.
- What sights and finish does it have?
- finish: Blue/Black.
- Is it new or used?
- New, in the original packaging.
- Can I buy it in United States?
- Yes. It ships to a licensed FFL dealer in United States; you pick it up there after the background check. Handguns ship only to a licensed FFL dealer, and you must be at least 21 and pass a background check to pick one up; some states add a permit or waiting period.
- Is it in stock?
- Yes, at $4081.91. Orders leave within 1-2 business days; shipping is free over $999.
Similar pistols in stock
Shop all →Ships to FFL
$2021.11
Capacity: 30 | Barrel Length: 10.3
Ships to FFL
Colt
★ 4.8 (32)
$1404.71
Capacity: 8 | Barrel Length: 5.0
Ships to FFL
ColtBlemished
★ 3.5 (2)
$1205.76
Capacity: 7 | Barrel Length: 3.0
Ships to FFL
Ships to FFL
Ships to FFL
Polymer80
★ 4.3 (4)
$569.81
Capacity: 15 | Barrel Length: 3.9
Ships to FFL
Polymer80
★ 5.0 (2)
$470.34
Capacity: 15 | Barrel Length: 4.02