The HK MR556A1 is a premium semi-automatic rifle designed for superior performance and reliability, drawing directly from its HK416 lineage. Chambered in 5.56mm NATO with a 16.5-inch barrel, this modern sporting rifle showcases Heckler & Koch’s proprietary gas piston operating system, replacing traditional gas tubes with a solid ‘pusher rod’ for enhanced functionality. Featuring a Free Floating Rail System (FFRS) with four MIL-STD-1913 Picatinny rails, the MR556A1 ensures robust customization and precision engineering. The HK rail system allows simple installation and removal while maintaining zero on reinstallation. With a Picatinny rail integrated into the upper receiver for optic and mechanical sight mounting, adjustable diopter sights, and a black polymer adjustable buttstock, this rifle is tailored for demanding civilian and match-grade applications. Its modular design enables easy compatibility with other high-quality AR-style firearms and legacy systems, making it a versatile choice for firearm enthusiasts.
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| Barrel Length | |
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| Centerfire/Rimfire | |
| Left Handed | |
| Optics Ready |