...
Agree with above thought/suggestion - Wolff main springs for Sigs.
You can do it yourself, as I did for the first time, and anytime after, using a Sig Armor DVD that shows, step by step, the easy process of changing ones factory 24lb/heavy pull, main spring with a kit of (5 main springs) from Wolff Springs.
20lb, 19, 18, 17, 16lb (gives you a choice, both in quicker/smoother-feeling) DA pulls, along with making the SA break/pull a tad lighter/sharper..
About the only thing you may need is an extra pair of hands for is when it comes time to put the temp retaining pin in (partial straightened out paper clip) in between the bottom of the hammer strut and new lighter main spring and the base/plate, then insert it back up and in, remove the temp holding pin (now held in place) and simply put back in the tiny pin you removed in the beginning.. 15 mins taking your time, and less anytime you re-due the procedure.. in the event"
Note: besides extra hands for that part, you need a board you can put over your lap, soft wood is best, and put the top of the hammer strut down onto the wood so, it sinks in just a tad but makes it stable for you to push/compress the spring down while that person puts in the paper clip.. Make sure you line up the strut (the way it will line up and go back in the gun) as to not put the spring/clip on backwards (won't go in gun.. lol) and you'll notice it right off the bat.. I made this mistake the first time, thus, having to re-due it again, but faster, easier, the more times you do it.. is the good part.. lol
Say you try the 19lb spring but you want it to be lighter, yet, thru testing, not yet taken, being 300 flawless rounds, to be sure of no light-strikes, for dependability/reliability, you decide to try a 17lb main spring (in your kit).. You really like this, easy DA pull, now all ya have to do is give it a 300 round test if it continues to work during that test time.
The DVD sells for around 24 bucks, IIRC, but a friend lent me his..
Have done it on 2 of my Sigs, got 2 more to go..
Worth the small price of just over 30 bucks including freight.. and what you learn and what you can, now, do anytime, yourself
To verify, to Wolff, what size main spring your gun has, long spring/all the way down to the bottom of the frame/grip or short spring with tall, plastic, inserted newer base, just take off one side of your grips to look.. long springs are aprox 2" and short springs are aprox 1" in length, he has to know..
Luck,
Ls
Ps.. Both my Sig P229n/r 40's use them: one with 17lb and other with 18lb Wolff main springs.. Both have over 4000 rounds on lighter main springs and no light strikes - One gun did go about the agv round count, wise, 4000 - 5000 rounds between new replacement return springs, otherwise, very little/noticeable extra wear on the return spring.. Basically, full lives, if made right, going in..