MR556 A4 Pistol 11″

The 11-inch pistol configuration of the MR556 A4 — the civilian HK416 descendant in 5.56×45, running HK’s short-stroke gas piston rather than direct impingement.

The short barrel makes it considerably handier than the 16.5in rifle, at the cost of muzzle velocity. As a pistol configuration it has no stock, which is the legal distinction from the SBR version.

Worth knowing: pistol, SBR and rifle configurations are legally distinct and the rules differ by state. Confirm what applies where you live before ordering. The SBR version is the same barrel length with a stock and NFA paperwork.

Parts note: MR556 and MR762 share some components — bolt catch sleeves, sear springs, forward assists — but barrels, buffers, gas blocks and magazines are caliber-specific. Browse upper receiver parts and lower receiver parts.

Compare configurations in the MR Series.

Firearms and regulated components are not sold directly on this site. Listings are informational and link to the manufacturer web shop or an authorised dealer; transfers must be completed through an FFL.