The gloss black Top Mount Base #18 from Weaver has been machined to tight tolerances for a custom fit. This aluminum base offers maximum strength so that the rings will hold tight.
Rear Base for:
- Marlin 88, 89, and 98
 - H&R 65, 165, 150, and 151 (auto), 250, 251, 264, 265, 365, 450, and 550
 - Remington 12A, 121 with 3/4" or 13/16" diameter barrels, 12C octagon barrel, 25
 - Stevens 416
 - Winchester 43
 
Front Base for:
- Marlin 88, 89, and 98
 - H&R 65, 165, 150, and 151 (auto)
 - Winchester 43