Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical Billet 9mm Flat Top upper with Intergraded gas deflector, short ejection port door, Mil-Spec Type III Hardcoat finish, T-markings and our logo. 10.5" or 16" Green Mountain Chromoly Match grade...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Barrel is Cold Hammer Forged 4150 Chromoly...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Lothar Walther Barrel, LW-50 Stainless, M4...

Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Lothar Walther Barrel, LW-50 Stainless, M4...

  Receiver Specs The Mil-Spec M4 flat top upper receivers are made and designed to be used with our piston system. The op-rod hole is the proper diameter so a bushing is not required at all. M4 feed ramps Spider...

M4 flat top with 11.5" or 16" 1x16 twist chrome moly barrel (M4 cut on 16") M4 handguards Flat top gas block or front site post Birdcage flash hider Spike's Tactical .22LR bolt Charging handle. **FYI: The legal...

Options available include Daniel Defense AR-15 Lite rails in 12.0, 10.0, 9.0 and 7.0 and various sized barrel lengths (keep in mind that the barrel goes inside the receiver approximately 1.5") we will do custom lengths to...