WEAVER NUMBER 25 TOP MOUNT BASE
USED AS FRONT BASE ON:
BROWNING BLR, SAUER SHR 970
USED AS REAR BASE ON:
BROWNING BLR, MOSSBERG 910, RM7, SAUER SHR 970,
WINCHESTER 52 (HOLE SPACING DIFFERENT FRONT & REAR), 61 OCTAGON BARREL
http://www.weaveroptics.com/rings_bases/bases/