Standard One Piece Base - 99 Black Leupold STD 1-Piece Bases fit most rifles. The forward part of the base accepts a dovetail ring locking it solidly into position. The rearring is secured by windage adjustment screws. Warranty: Full lifetime guarantee. If any product has defects in materials or workmanship Leupold will at their option repair or replace it free. Even if you are not the originalowner.