Fostech Complete Bolt Carrier Group Black

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<p>This is a standard full-auto M16 cut bolt carrier group. It is designed to function with the Echo AR-II and the Echo Sport.</p><p><strong>Bolt Assembly</strong></p><ul> <li>Bolt: Shot Peened; Magnetic Particle Inspected and Marked</li> <li>Bolt Material: 9310 Alloy Steel</li> <li>Compatibility: .223 / 556 / 300BLK</li> <li>Extractor: Shot Peened Hardened Tool Steel</li> <li>Extractor O-Ring: Viton Mil-Spec</li> <li>Gas Rings (3): Mil-Spec</li> <li>Finish: BLACK NITRIDE</li></ul><p><strong>Bolt Carrier</strong></p><ul> <li>Material: 8620 Steel</li> <li>Design: Heavy Profile M16 Style</li> <li>(Preferred for most AR-15 Builds)</li> <li>Gas Key Screws: Grade 8; Properly Torqued and Staked to Mil-Spec</li> <li>Gas Key Material: 4130 Steel</li> <li>Finish: BLACK NITRIDE</li></ul><p><strong>Cam Pin</strong></p><ul> <li>Material: 4140 Steel</li> <li>Finish: BLACK NITRIDE</li></ul><p><strong>Firing Pin</strong></p><ul> <li>Material: 8740 Steel; Centerless Ground; Hard Chrome Plated</li> <li>Weight: 11.6 Ounces</li></ul><p><strong>100% USA Made</strong></p>