This aluminum thread adapter allows the mounting of a 3/4-16 Oil Filter Solvent Trap to the end of a non-threaded Ruger 10/22. This adapter features a nylon tipped set screw which will not mar your barrel like brass tipped or alloy steel set screws do. This requires absolutely no modification to the weapon. This is a great way to clean your Ruger 10/22 barrel without the mess!This adapter will not fit bull-barrel rifles.