NEW FRONTIER BCG AR40 40S&W/10MM AUTO BLACKNEW FRONTIER BOLT CARRIER AR4040S&W 10MM AUTO BLACKFEATURES: US Made 8620 steel w mag phosphate finish Ramped carrier to work w both 9mm & standard AR hammers Precision milled for use w Glock style lower receivers M 16 cut for use in transferable full auto MG's, dealer post sample MG's or other legal machine guns This bolt can also be used in a large frame lower to run 10mm
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