Heckler & Koch, MR556 A4 Upper Receiver, 223 Remington/556NATO, 16.5" Barrel, Threaded 1/2X28, M-LOK Handguard, Anodized Finish, Black, Fits AR-15 Lower Receivers, Includes Bolt Carrier Group, Charging Handle, Buffer Weight and Buffer Spring
Features
- suppressor-ready concentric 1/2x28 threads
- adjustable gas regulator for shooting suppressed and unsuppressed
- m-lok interface with integral ambi qd cups
- continuous picatinny rail interface between upper receiver and handguard
- extended, ambidextrous
- charging handle with dual claws
- match rifle cold hammer-forged barrel
- includes bolt and buffer
- m-lok handguard
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