The rifle features the signature 18.5-inch FN cold hammer-forged, chrome-lined barrel and operates from a closed-bolt position. The FN M249S®, a semi-automatic version of the M249 SAW light machine gun, was originally developed by FN Herstal as the FN MINIMI® and adopted by the U.S.These BCG's have been Magnetic Particle Inspected (MPI) but are not marked. This Bolt carrier group will hold up in the harshest conditions and outlast and compete with the best BCG's on the market. Home Default Category AR 308 & AR 15 parts AR 15 Parts Upper Parts Bolt Carrier Groups.
