There's no longer a need to search for front and rear bases for your most popular firearms. Weaver Base Pairs feature tough, lightweight aluminum construction to hold up to the most powerful recoil. The Weaver cross lock design means a tight, secure fit on your firearm. These bases accept all Weaver top mount cross lock rings. Fits Ruger American; Savage A17, Axis, Series, Edge, 212, 10, 11, 12, 110, 111, 112, 114 series (LA w/Accutrigger); Stevens 200 and 10 ML II.