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The S&W internal safety lock (introduced circa 2001) is a key-operated mechanism built into the left side of the frame above the cylinder release
686 (round butt variants only)
Genuine S&W Part: Factory OEM component (Part #391310000)
It is not compatible with
Upgrade your Smith & Wesson Sigma pistol with this precision-engineered extra power magazine spring from Wolff Gunsprings
Wolff Reduced Power Variable Recoil Spring 12LB for S&W 645/745/4506/4526/4546 .45 ACP 47312 k15-3u The S&W internal safety lockWolff Reduced Power Variable Recoil Spring 12LB Premium reduced power variable recoil spring designed specifically for Smith & Wesson . 45 ACP pistols. This 12 pound spring provides smoother cycling and reduced felt recoil while maintaining reliable function. 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 spring (12 LB)
US$ 59.95
US$ 137.47
US$ 250.00
US$ 153.00
