Nobody makes bases to fit as many guns as Weaver. Yet each base is machined to tight tolerances for a custom fit. They're designed to fight the effects of recoil with a square cut notch that precisely mates to the sturdy cross bolt in every Weaver Detachable Ring. Custom hardened fastening screws come with every Weaver base.Specifications and Features:Manufacturer Number: 48012Finish: BlackFits: H&R 755, 765, 852 and 865, front or rearMarlin 80, 81 and 980, rearMossberg 25, 26, 42, 46M, 140 and 142, rearMossberg 45 to 46 with 3/4" barrels, rearMossberg 320, 340, 342 and 620, rearMossberg 50, 51, 151, 152, 350 and 352, front or rearMossberg 43, 44, 144, 46BT and 35, rearMossberg early models 45, 46, 45A and 46B with 13/16" barrels, rearRemington 514 and 550, front or rear; drilling and tapping requiredSavage 4 and 5, rearSavage 6 and 7, front or rearSavage 219, rearSears 42 and 43, rearStevens 56 and 66, rearStevens 57, 76, 4171/2 and 762, front or rearStevens-Springfield 85, 87 and 872front or rear; drilling and tapping requiredWinchester 57, 69, 69A, 72 and 47, rearWinchester 74, front or rear