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The 5" RecoilMaster guide rod system is used in STIi pistols with a 5-inch slide and either a bushing or bull barrell. The spring weight (light or heavy) pertains to caliber where 9mm and 38 Super pistols use a light Recoilmaster and 40 S&W and 45 ACP pistols use a heavy Recoilmaster. The guide rod system includes a guide rod, guide rod plug, inner and out springs, and a takedown tool.
Note: STI has discontinued the sale of aftermarket parts. As we run out of styles/calibers they will no longer be available.