Last one! All have sold out. One of the most popular uppers for Radical Firearms now replaced by the MLOK version the Keymod / Quad Hybrid is the best design copied by others. This has been discontinued, when they are GONE THEY ARE GONE. New in the box 8.5" 300 Blackout with a 7" light weight Keymod / Quad Hybrid rail. BCG and charging handle not included but I can add them for additional money. This is a limited time ARMSLIST sale. Remember, this is a Radical Firearms upper, includes a lifetime warranty. They manufacture all their own stuff. Most others assemble. You can call or TM me REDACTED.
Nitride BCG rated full auto and mil-spec charging handle add $90 Nickel Boron BCG rated full auto and mil-spec charging handle add $120 ALL have a lifetime warranty.
  • Barrel Length: 7.5"
  • Gas System: Pistol Length
  • Barrel Profile: HBAR Profile
  • Barrel Material: 4140 Chrome Moly Vanadium
  • Barrel Finish: Melonite
  • Muzzle Thread: 1/2x28
  • Chamber: 300 BLK
  • Twist Rate: 1:7
  • Barrel Extension: M4 Feed Ramp
  • Gas Block Type: .750 Low-profile Gas Block
  • Muzzle Device: A2 Flash Hider
  • Upper Receiver Material: Forged 7075 T6
  • Upper Receiver Style: M4 Mil-Std
  • Upper Receiver Finish: Type III Anodizing
  • Forward Assist: Yes
  • Dust Cover: Yes
  • Handguard Type: Free Float
  • Handguard Style: Keymod / Quad Hybrid Thin Rail
  • Handguard Length: 7"