PALMETTO STATE ARMORY 5.56 PREMIUM FULL AUTO BOLT CARRIER GROUP - 8779

Made in USA.  Bolt is made of Mil-spec Carpenter 158 steel, Shot peened, High pressure tested and Mag Particle Inspected.   Gas key is machined out of bar stock, chrome lined phosphate coated, and secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is phosphated outside and chrome lined inside.  Laser engraved with the PSA logo. For packaging considerations, BCG will be packed dry.  As a result, it will have a grey, dusty appearance that will turn  black with the application of CLP or other preferred lubricant. Extractor Spring Black Extractor Insert Mil-Spec O-Ring