The Optimized Carrier Key Screws (OCKS) are designed to provide significant advantages over the standard cap screw used in carrier keys.
Proper staking is crucial to reliable operation. An improperly staked carrier key can become loose under firing, and can cause a debiliating malfunction that can render a firearm inoperable in the field. The OKCS has sharp, deep, and effective knurling with 12 deeper splines. These OCKS allow for metal to flow into the space when staking, creating more metal on metal contact.
The OCKS are standard on the http://www.m4carbine.net/showthread.php?195130-On-loose-carrier-key-screws., but are a critical value upgrade for any Bolt Carrier Group. The torque value of the OCKS is 50-58 in/lbs. If you'd like to read more, check out the original thread on
Ned Christiansen is the lead developer, and Roger Wang at Forward Controls Design was a huge proponent of the OCKS, so the items are nested under Forward Controls Design for easy reference.
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