5.7 x 28 Blow Back Bolt Carrier

This download includes a blow back style (no gas tube needed) 5.7x28 bolt carrier! These use a standard firing pin, but we have included the spring as well that is needed to ride over your firing pin for these to function properly. Also these unique bolt carriers are 2pcs, unlinke your standard ar15 carrier these thread together with a 5/8-18 thread. These will work with our 5.7 x 28 magazine 3d solid model as well! Available in solidworks, step, and parasolid formats!