• 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 Vanadium Alloy, M4 barrel extention, Chrome chamber and bore, 5.56mm Nato chamber, 1:7 Twist, Magnetic particle testing on every barrel, Phosphate finish.
• M4 profile with Carbine-length gas system.
• Barrel is Phosphate finished under the Railed gas block.
• The M16 carriers are Chrome lined with a Mil-Spec phosphate finish.
• Forged Mil-Spec carrier key, Chrome lined, attached with Grade 8 hardware and Properly staked.
• MP tested bolt, Each extractor is fitted with a Mil-Spec black insert and Mil-Spec Viton o-ring.
• Spike's Tactical free float rail system.
• Forged Mil-Spec charging handle.
• A2 Flash Hider.
• Each upper comes with an ST-T2 buffer.

Because this product comes from Spike's Tactical, please allow up to 2-3 weeks for delivery.