Heckler and Koch MR556 A4 Upper Receiver 5.56 16.5 Barrel

Heckler & Koch MR556 A4 Upper Receiver Features This upper receiver kit includes everything you need for a top-tier build: a bolt carrier group charging handle buffer weight and buffer spring. The 16.5-inch barrel features concentric 1/2x28 threads for suppressor compatibility paired with an adjustable gas regulator to ensure reliable cycling whether suppressed or unsuppressed. The cold hammer-forged barrel is designed for exceptional longevity and match-grade accuracy. The M-LOK handguard with integrated ambidextrous QD sling cups offers robust mounting flexibility. A continuous Picatinny rail bridges seamlessly across the upper and handguard providing an ideal surface for optics and accessories. The extended ambidextrous charging handle with dual claws makes manipulation fast and intuitive whether you re running slick or gloved. Heckler & Koch MR556 A4 Upper Receiver Specifications Manufacturer: Heckler & Koch (HK) Model: MR556 A4 Upper Receiver Series: MR556 Category: Uppers Caliber: .223 Remington / 5.56 NATO Barrel Length: 16.5 Thread Pattern: 1/2x28 Firearm Fit: AR-15 Lower Receivers Handguard: M-LOK Interface with Ambi QD Cups Rail: Continuous Picatinny (Upper to Handguard) Charging Handle: Extended Ambidextrous Dual-Claw Barrel Type: Match-Grade Cold Hammer-Forged Gas System: Adjustable Regulator for Suppressed/Unsuppressed Finish: Anodized Color: Black Includes: Bolt Carrier Group Charging Handle Buffer Weight Buffer Spring