Heckler & Koch MR556 A4 5.56 NATO 30rd, SBR
2 in stock
Description
The Heckler & Koch MR556 A4 is HK-USA's semi-automatic commercial version of the HK416, built here in a short-barreled rifle configuration with an 11-inch barrel. The short-stroke gas piston operating system keeps combustion gases out of the receiver, a design HK developed for military service and carried over to the civilian MR556 line. Shooters who want a compact 5.56 NATO carbine with military-pattern construction and suppressor-friendly gas control will find this configuration well suited to the role.
Shortening the barrel to 11 inches trims length without giving up the free-floating M-LOK handguard or the continuous top rail that runs from the upper receiver forward. Controls are fully ambidextrous, and the adjustable stock lets the rifle fit across body types and layered gear. Registered as an NFA Short-Barreled Rifle.
Heckler & Koch MR556 A4 Features
- Short-stroke gas piston operating system that keeps carbon and heat away from the bolt carrier for cleaner, cooler running
- Adjustable gas regulator so the rifle can be tuned between suppressed and unsuppressed shooting
- Cold hammer-forged 11-inch barrel with 1:7 twist and a 1/2x28 threaded muzzle for muzzle devices or a suppressor
- Free-floating M-LOK handguard with a continuous top rail, giving uninterrupted optic and accessory mounting across the receiver and forend
- Fully ambidextrous safety, magazine release, and bolt catch, plus an extended ambidextrous charging handle for support-side work
- Adjustable HK-style buttstock covering a 27.9 to 31.7 inch overall length range
Specifications
- Condition: New
- Manufacturer: Heckler & Koch
- Model: MR556 A4 SBR
- Operating System: Semi-automatic, short-stroke gas piston with adjustable gas regulator
- Barrel Type: Cold hammer-forged, 1:7 twist, 1/2x28 threaded muzzle
- Safety System: Ambidextrous safety selector
- Sight Type: Flat-top upper with full-length Picatinny rail
- Finish Type: Black anodized
- Included Accessories: One 30-round magazine
- Additional Notable Specs: NFA Short-Barreled Rifle, free-floating M-LOK handguard, ambidextrous magazine release and bolt catch, extended ambidextrous charging handle, adjustable stock, 27.9 to 31.7 inch overall length
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