MEGA MACHINE BILLET UPPER RECEIVER WITH M-4 FEED RAMPS; STRIPPED.
Machined from billet 7075-T6 aluminum vs. the more commonly used 6061 for a 70% increase in strength.
Black Hard anodized with a surface hardness of 60 Rockwell.
Features a stout octagonal shaped profile for increased strength, weight, and stress resistance.
Works great in long barrel applications.