Check the listing for details. Weaver Mounting Rifle Scope Base # 54 48054 Browning BAR BLR Lightning BPR. Color: Black, Condition: New other (see details). Listed at 9.99 USD. Weaver 48054 Highlights Rear Base for Select Browning, Musgrave, Colt, H&R, Schultz & Larsen, Springfield, Winchester and Front Base for Select Browning, Colt, Winchester Features The gloss black Top Mount Base #54 from Weaver has been machined to tight tolerances for a custom fit. This aluminum base offers maximum strength so that the rings will hold tight. Please note that for the Winchester SXR and for the Browning BAR, BAR II, Mark II, BLR Lightning (Lever), and BPR the front base screws must be shortened by grinding. Please note that the Springfield 03 may require bolt and/or safety alteration, otherwise the firearm will not function safely or properly. Consult with a qualified gunsmith. Compatibility Rear Base for: Browning BAR, BAR II, Mark II, BLR Lightning (lever), BPR Musgrave Mark I & Mark II Colt Coltsman 264 & 30-06 Cal. (round receiver) H&R 300 & 301 L.A. 270, 30-06, 7mm & 300 Win (1973+) Schultz & Larsen Springfield 03 Winchester SXR Front Base for: Browning BAR, BAR II, Mark II, BLR Lightning (lever), BPR Colt Coltsman 264 & 30-06 Cal. (round receiver) Winchester SXR UPC: 076683480545