If you are the type that wants to be completely in control of how your rifle is set up, then you have come to the right place. The EVOLVE receiver sets are the best foundation to build your next rifle project on. They come standard with our patent pending Rapid Action Cam (R.A.C.) system installed which replaces those pesky out-of-date pins and detents, but also locks up tighter than any AR on the market. They are ready out of the box, so pick your platform and get started building your new rifle. Don’t forget to add a matched ARCA Rail handguard to complete your chassis!