Steel bolt is shot-peened for extra surface hardness, then magnetic particle inspected (MPI) for cracks and flaws to ensure reliability and long service life. Models available for rifles chambered in 5.56mm/.223. Comes completely assembled, with gas rings, extractor, and ejector installed.
AR-15, Issue:09, Page:009
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Big Book Catalog, Issue:66, Page:009
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Big Book Catalog, Issue:73, Page:032
SPECS: Carpenter 158 steel, phosphate coated, matte black.