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Potential safety hazards
This is a precision operation that requires:
Sear Housing Block: A single
Smith & Wesson OEM factory replacement magazine release for the Model 639 9mm pistol
Wolff Extra Power Variable Recoil Spring 20LB for S&W 645/745/4506/4526/4546 .45 ACP 47320 mainspring guide pin Potential safety hazardsWolff Extra Power Variable Recoil Spring 20LB Premium extra power variable recoil spring designed specifically for Smith & Wesson . 45 ACP pistols. This 20 pound spring provides increased reliability with full power loads and ensures positive cycling with factory ammunition. Compatible Models: Smith & Wesson Model 645 Smith & Wesson Model 745 Smith & Wesson Model 4506 Smith & Wesson Model 4526 Smith & Wesson Model 4546 What's Included: Variable recoil
