This fully CNC machined bolt asembly from Power Custom is a great addition to any custom 10-22. All of the work has been done: surfaces have been trued, corners have been radiused, and firing pin protrusion and headspace have been set to correct specs. A Power Custom Titanium Extractor Claw is fitted and tuned for positive extraction. The Beveled Titanium Firing Pin is pinned in position to eliminate the vertical movement found in the factory design. Add to all of this the fact that it is a direct drop in fit and you have a combination that is hard to beat.Notes: This bolt is also designed to work with the last shot bolt open feature found on the Custom Shooting Technologies (CST) magazines.