Enhanced Bolt Carrier Group223 5. 56 NATO AR15 M16 (full auto) Bolt: Case hardened 9310 steel, shot peened w black nitride finish Carrier: Billet machined case hardened 8620 steel w black nitride finish Gas Key: 4130 steel, attached using Grade 8 hardware and proper staking techniques The Enhanced Bolt Carrier Group for AR15 M16 platform weapons was designed to minimize carrier tilt and reduce friction inside the upper receiver by relocating key bearing surfaces. All materials,
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