This CNC-machined Volquartsen 10/22 receiver is a drop-in replacement for the factory 10/22 receiver. It comes complete with take-down action screw, V-locking block with retaining screws, recoil buffer, and trigger guard cross pins.Features a Universal Red Dot Mount providing multiple mounting locations for red dot optics. This allows the optic to mounted closer to the bore axis. IncludesPre-Installed Filler Screws on all Optic Mounting Holes Red Dot Footprints CompatibleBurris Fast FireC-More RTS 2C-More Slide RideJP Enterprises JPointLeupold DeltaPointShield Sights Mini SightSig Sauer Romeo 1 ProSig Sauer Romeo 3 MaxSig Sauer Romeo 3 XLTrijicon RMRVortex ViperVortex VenomVortex Razor