Stainless steel gas block is built to the same dimensions as the original factory part for an easy drop-in fit on a Ruger Mini-14 or Mini Thirty. Rust resistant, natural dull silver finish blends with factory stainless steel rifles and provides a nice visual contrast on blued rifles. Easy installation with simple hand tools, using the factory gas block mounting screws. Permanently attached sling loop accepts slings up to 1" wide. Gas flow is non-adjustable. Models available for the following: .625" for Mini-14 580, 581, 582 Series, 6.8, Target Model, and Mini-30 only; .562" for Mini-14 181 Series thru Pre-580 Series.
Big Book Catalog, Issue:67, Page:166
SPECS: Stainless steel, natural finish. Includes upper and lower half; uses factory screws. Mini-14 fits rifles with .562" O.D. barrels and serial number prefix 181 thru Pre-580 Series. Mini-14/30 fits Mini-14 rifles with .625" OD barrels to include 580, 581, 582 Series, 6.8, Target Model, and Mini-30.