Used as FRONT BASE on:

Marlin 39A,

Mossberg 43,44, 144, 46BT

35, Late models 45, 46, 46A 46B w/ 13/16″ dia. Bbls

Savage 19. 23, 93F Heavy Bbl

Winchester 75 Target

Used as REAR BASE on:

Mossberg 40

Remington 514

Savage 3, 93F, Heavy Barrel