Description
Cross Machine Tool AR15 Billet Upper Receiver – UPUR1
The Cross Machine Tool Ultra Precision Upper Receiver is the perfect match with any mil-spec lower. The UPUR-1 is machined from billet 7075 T6 aluminum unlike the more commonly used 6061. Using the 7075 T6 aluminum gives the UPUR a 65% increase in strength and rigidity over 6061 aluminum receivers.
