Description Service Paks For use in: Colt 1911, 1911A1, 1991, Gov’t, MKIV, and Gold Cup series pistols. Please choose by caliber as magazine springs are caliber specific. Type I – contains the following factory specification springs: factory weight recoil spring, firing pin spring (extra power), hammer spring, magazine catch spring, plunger tube spring, firing pin safety spring and sear spring. TYPE II contains all of the springs described in the Type I pak above plus a magazine spring. The .45 Service Pak II contains a 10 pound extra power 7 round magazine spring. The 9mm and .38 Super Service Paks II contain a 7.5 Lb. extra power magazine spring.
