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Details
Mil-Spec Carpenter No. 158® steel bolt
Shot Peened Bolt
Individually high-pressure tested
Individually magnetic particle inspected
Chrome Lined Full-Auto Carrier
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Gas Key Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor
Extractor Spring
Extractor O-ring Insert
Features
Bolt is made of Mil-spec Carpenter 158 steel, Shot peened, bolt is marked"MP", but is individually high-pressure tested and Magnetic 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. 
These bcg's were purchased as a contract overrun for an overseas Eastern European contract. We purchased them at a great price and can pass the savings on to you.
Palmetto State Armory is offering a full warranty on these bcg's.
These are a limited buy; once they're gone, they won't be available again.