Weaver's top mount base is machined to tight tolerances for a custom fit.It offers maximum strength for rings to hold tight and is constructed of aluminum.Fits beretta pintail slug gun; bsa monarch med/la action, cf2; churchill highlander; rem 721; herters u9 w/round receiver; howa 1500; moss 100 atr,1500,1700; mpv; raptor arms; sauer 200; shilen w/round receiver; s&w 1500, 1600, 1700; weatherby vangauard; colt sauer; rem 700, 78,40x-l, 71, 725.Type: 1-Piece BaseModel: Top MountStyle: Top MountMisc: N/AFinish: SilverMaterial: AluminumPieces: 1Gun Type: RifleMount Type: ScrewsRings Included: No