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The Crucible AR-15 Bolt Carrier Group is a custom, high reliability upgrade to your current system and only available through Emerging Tactical Solutions. The Crucible is a Semi-Auto Bolt Carrier housing, Chrome Gas Key (Properly staked), Chrome Bolt with extractor spring and O-ring, and upgraded with POF-USA’s Gas Key & Roller Cam Pin. http://www.emergingtacticalsolutions.com/product-p/ar15.ets.001.htm