HK MR556A1 5.56 NATO Piston AR-15 with Lancer Carbon-Fiber M-LOK Handguard, Magpul Stock & SureFire Warcomp
The HK MR556A1 blends the battle-proven short-stroke piston of the HK416 with premium civilian features. This custom example stands out with a lightweight Lancer carbon-fiber free-float M-LOK handguard, a SureFire Warcomp muzzle device, and user-focused controls such as a Geissele ambidextrous charging handle. Built on forged 7075-T6 receivers and fitted with a cold-hammer-forged 16.5-inch barrel, it offers rugged reliability and clean operation in a refined, collector-grade package.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
What’s Included
- Lancer Systems carbon-fiber M-LOK free-float handguard (installed)
- SureFire Warcomp hybrid flash hider / compensator (installed)
- Hogue over-molded rubber finger-groove pistol grip (installed)
- Geissele Super Charging Handle, ambidextrous (installed)
- Magpul PMAG Gen M2 30-round magazine
The MR556A1 is the commercial descendant of HK’s renowned HK416, retaining the same short-stroke gas piston system that keeps fouling out of the receiver and enhances reliability under hard use.
Its 16.5-inch cold-hammer-forged CMV barrel is produced on German military machinery, features a nitride treatment for corrosion resistance, and is threaded 1/2x28 to accept the included SureFire Warcomp or other muzzle devices.
A Lancer carbon-fiber handguard trims weight while adding strength and expansive M-LOK slots for accessories. Combined with the continuous top Picatinny rail, the rifle offers flexible mounting options without excess bulk.
The rifle is further customized for ergonomic control: a Magpul MOE six-position collapsible stock tailors length of pull, a Hogue rubber grip improves purchase, and a Geissele ambidextrous charging handle provides smooth manipulation from either side.
Proprietary HK buffer components are tuned for the piston impulse, and the forged 7075-T6 receivers wear a durable black anodized finish. Made in Germany and the USA, this MR556A1 delivers HK’s signature build quality with thoughtful, weight-saving upgrades.