Ideal building block for a long lasting AR-15, this 7075-T6 Forged Aluminum Mil-Spec stripped receiver with M4 feed ramps has NiB-X coating inside and out to provide an exceptionally tough, ultra-smooth surface finish for outstanding wear resistance and lubricity. This upper works with standard carriers but is even smoother with a NiB-X coated bolt carrier and NiB-X charging handle.

Specifications and Features:
Precision Machined 7075-T6 Aluminum
NiB-X Nickel Boron Coated
40% More Wear Resistant than Chrome
Mil-Spec
M4 Feed Ramp
Flat Top Picatinny Rail
Easy Cleaning
Reduced Fouling
Increased Life
Reduced Friction
Olive Drab Green Topcoat