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 Savage 10, 11, 12 & 16 (short action), Striker pistol, 510, 512, 516, S/ A 10 ML (2 pc only) pre 2003 models. Savage 110, 111, 112, 116 (long action), 210 shotgun (use X-high rings) pre 2003 models.