Designed for regular rifles and AR modern sporting rifles. Bore guides properly align the cleaning rod and reduce solvent overflow, protecting the bore and action of your rifle. Screw-in design creates a tight chamber fit, which aligns bore and protects action area. Designed for regular centerfire and AR modern sporting rifles. AR link included along with an AR collar nut for easy AR rifle cleaning. Fits bolt diameters .695 or smaller - Compatible with cleaning rods up to .375 diameter. 9 Piece kit includes a compact plastic storage case Made in USA