Lightweight aluminum bases fit a wide range of modern and older rifles, plus shotguns and long range handguns. Sold each; order front and rear base. Click here to find the right base for your rifle model. One piece bases and base pair sets available for some models. Base pair sets are marked with * or **. View more models: #68 through #604 Mfg: Weaver SPECS: Aluminum, polished blue finish except Matte (M), Silver (S). Extension bases: Front (F), Rear (R). Fits Top Mount and See-Thru Mount Rings.