The HK MR556A1 in 5.56mm NATO with a 16.5-inch barrel is a premium-level semi-automatic modern sporting rifle engineered by Heckler & Koch as a descendant of the renowned HK416. Featuring a proprietary gas piston operating system with a robust operating rod instead of a gas tube, the MR556A1 offers enhanced reliability and performance over traditional AR-15 platforms. Its Free Floating Rail System (FFRS) handguard provides four MIL-STD-1913 Picatinny rails for easy accessory mounting, and the rail system ensures quick removal and reinstallation while retaining zero. Additionally, a precision-machined Picatinny rail is integrated into the upper receiver for optics and sight mounting. Designed for versatility, this model provides full interchangeability with other high-quality AR-style firearms and offers upper receiver kits for retrofitting legacy AR systems. The MR556A1 is a standout choice for precision-focused civilian shooters and firearm enthusiasts.
| Action | |
|---|---|
| Barrel Length | |
| Centerfire/Rimfire | |
| Left Handed | |
| Optics Ready |