A.R.M.S. #37 Ring spacers allow you to confidently use 30mm Rings with 1" tube diameter optics. Simply install the steel collars between your optic and 30mm rings for a secure fit.

Features and Specifications:
Manufacturer Number: 37
Allows for use of 30mm rings with 1" tube diameter optics
Installs between your optic and 30mm rings
Steel Phosphate
Black