Mega Arms - SBU Billet Upper w/ Side Charging Slot
Billet AR15/M4 SBU Upper Receiver.
•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.
• 12.7 oz.