Hk Upper Mr556a4 5.56 11" Blk

The HK Upper MR556A4 5.56 11" Black is a premium piston-driven upper receiver assembly designed for law enforcement, military, and civilian operators who require reliability under sustained fire. This upper receiver is part of Heckler & Koch's MR556A4 platform, which is the civilian version of the renowned HG 416, a modern sporting rifle used by elite tactical units worldwide.

Featuring an 11-inch barrel optimized for 5.56 NATO/.223 Remington ammunition, this upper receiver incorporates a short-stroke piston system that minimizes carrier tilt and extends component life compared to direct impingement systems. The barrel has a 1:7 twist rate suitable for a wide range of bullet weights, and the flat-top Picatinny rail allows for easy mounting of optics. Additionally, the integrated dust cover and forward assist enhance reliability in challenging conditions.

Operators looking to build compact yet capable rifle systems for short-barreled rifles, precision shooting, or specialized CQB setups will find this upper receiver to be an excellent choice. Finished in durable mil-spec anodized black, it is engineered to perform reliably across a variety of temperatures and high round counts typical of professional use.