The Radical Firearms M4 Upper Receiver is a flat top, law-enforcement grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This fully mil-spec compliant receiver provides a high-quality upper for any level budget or shooter. Comes complete and assembled with Upper Receiver, Forward Assist, Ejection Port Door, RF Barrel Nut. 16" HBAR Barrel and A2 Flash Hider. Our free-float handguard: First-Gen Hybrid Rail (FHR) keeps your hands cool and provides plenty of room for accessories. The FHR rail even has the capability to add attachments other than on the top picatinny rail, as it does allow keymod attachments and rail sections. Complete upper including Bolt Carrier Group and Charging Handle.
- 16" HBAR 4150V Chromoly Melonited Barrel
- 1 in 10" twist rate
- 5/8x24 thread pitch
- HPT/MPI 7.62x39 Bolt
- M4 Feed ramps
- Low Profile Micro Gas Block
- DGI Stainless Carbine-length gas tube
- Direct Gas Impingement
- MIL-STD A2 Flash Hider
- Radical Firearms 15" Free Float FHR (First-Gen Hybrid Rail)
- Quad Picatinny Rails on all four sides for at the fore end of the rail for mounting Lights, Lasers, Bipods & Sights
- Keymod accessory slots on the sides and bottom to accept accessories
- MIL-STD Forged Upper Receiver with Forward Assist, Shell Deflector, and Dust Cover
- MIL-STD Charging Handle
- Made in Houston, Texas U.S.A.!