Spikes Tactical M4 Upper With Magpul HandGuard - Drop the spikes tactical 5.56mm NATO M4 carbine 16in forged upper receiver right into your current build to create a powerful and reliable firearm for sport shooting, self-defense or tactical needs. These AR15 upper receivers developed by Spikes Tactical is crafted from 7075 T6 aluminum that's rugged and lightweight to survive harsh conditions without inhibiting your mobility. This spikes tactical 5.56mm NATO M4 carbine 16in forged upper receiver kit comes with everything you need to upgrade your complete upper, and that includes a Mil-Spec phosphate coated barrel that resists corrosion and harmful elements. Features 7075 T6 Construction Forward Assist Ejection Port Door Ejection Port Door Spring Ejection Port Door Rod 16in M4 Profile Barrel: MIL-B-11595E CMV Chrome Lined 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 Nato Chamber .750 Gas Block Seat M4 Feed Ramped Barrel Extension Mil-Spec Phosphate Coating Carbine Gas Tube: Black Nitride Inside and Out Gas Tube Roll Pin Charging Handle: Forged Aluminum Mil-Spec Type 3 Coating Phosphate M16 Complete BCG: Phosphate Coated Laser Engraved with ST Spider logo High Pressure Tested (HPT) Magnetic Particle Inspected (MPI)