Complete, fully assembled, bolt/carrier group is machined to mil-spec dimensions using the latest manufacturing techniques and quality-control testing to deliver superb reliability in both semi-auto and select-fire rifles. Carrier of hardened 8620 carbon steel has an M16-type full-length shroud on the underside to trip the auto sear on full-auto/burst rifles. Bolt is machined from ultra-hard Carpenter 158 steel alloy and magnetic particle inspected (MPI) to ensure there are no internal flaws to compromise structural integrity and cause premature failure. Bolt exterior is shot peened to produce an exceptionally uniform surface that aids in smooth movement through carrier. Fully staked carrier key and tool steel extractor further aid reliable cycling. Laser-engraved Spike’s Tactical logo on the side of the carrier is visible when the ejection port door is open. .223/5.56mm fits standard AR-15/M16/M4 rifles; 6.8mm SPC enables conversion to the hard-hitting performance of the 6.8mm SPC round. A 6.8 barrel and magazine (both available separately) are necessary to complete the caliber conversion.
SPECS:
Bolt – Carpenter 158 steel alloy. Carrier – 8620 carbon steel, chrome lined. All major components have mil-spec phosphate finish, matte black. 6.8mm SPC - Use with rifles chambered for 6.8 SPC cartridge only.
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