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This is a world class trigger kit.
With a simple polish job this kit will give your . a smooth trigger pull.
The 3.5 pound polished (minus) connector will lighten the trigger weight.
The adjustable over travel stop will give your . a very short reset.
The wolf heat tempered springs will give your . up to 20 different applications.
With the 4,5 and 6 pound firing pin springs your trigger weight will very from 2 pound to about 4.5 pounds.
The 4 pound firing pin spring is great for a competition trigger and the 5 or 6 pound firing pin springs are great for self defense.
Drop in kit. No modifications necessary.
(FITS Generation 4 models 22,23,24,27,31,32,33,35) 
(Does not fit Gen 1-3 models) 

(Does not fit models 17,18,19,20,21,25,26,28,29,30,30s,34,36,37,38,39,40,41,42,43)
This kit includes:
1) 3.5 pound polished (minus) connector
1) Gen 4 (40 CALIBER/ 357 SIG) adjustable over travel stop trigger housing
1) over travel stop adjustment tool
1) wolf 6 pound trigger spring (stock weight = 5Lbs.)
1) wolf reduced poundage safety spring
1) wolf 4 pound firing pin spring
1) wolf 5 pound firing pin spring
1) wolf 6 pound firing pin spring (stock weight = 5.5 Lbs.)