Bustmaster M4 / AR 15 5.56 bolt

solid, no-nonsense 158 Steel AR bolt

Bushmaster is one of the orifnial names in the AR15 market, and they have been making quality rifles and parts for decades.  Their 158 steel allow bolt is magnetic particle inspected and black oxide coated, and will fit into any mil-spec bolt carrier.  Great for your next build, or to keep in your bag in case you need to replace a bolt in the wild.  Competitively priced.  Charlie's exclusive.