Our National Match Chrome
5.56mm bolt is made from SAE 9310 steel and Precision Ground in three critical
areas after heat treating to Mil- Spec. This provides the most accurate fit
possible on the center support ring, and the bolt tail. Grinding the back of
the lugs true to the bolt face gives you a bolt that locks up true and square
to the center of the bore. All of our bolts are Mag Particle Inspected to
detect any stress fractures that might occur during the heat treat process. This National Match Chrome Bolt is installed in all our National Match Bolt Carriers.
YES, We Mag Particle Inspect all our bolts. We don't just mark them