Steel, Teflon-coated, to eliminate bind on bearing surfaces which can prevent reliable cycling. Mil-spec bolt assembly is machined to strict tolerances for a drop-in fit and requires no gunsmithing. 6.8 mm Bolt functions with standard AR15/M16 Bolt Carriers, Cam Pins, and Firing Pins
SPECS:
Steel, Teflon-coated, matte black. Meets mil-spec #8448510.
Catalog page 11