Weaver Rings and Base System for Pistols. New Old Stock.

Models include:

Colt Python; No. 304
Colt Trooper, .357, Officers’ Model Match through 1953-1970; No. 303
Colt Trooper MkIII; No. 304
Ruger .22 Auto Pistols; No. 306
Smith & Wesson N Frames; No. 309