Rubber City Armory Bolt Carrier Group-6.5 Grendel/6mm ARC w/OCKS

• Blacknitride+ Enhanced
• Enhanced Radius Machined 6.5mm Type II Grendel Bolt
• RCA Firing Pin, Cam Pin, Retaining Pin
• Carrier 8620
• 4140 pre hardened billet gas key
• OCKS Upgrade!
• *LIFETIME WARRANTY*

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.