I purchased the MCARBO P938 Trigger Kit and Polishing Kit some time ago but had to wait till now to use, as it took months for my Sig P938 Legion to be delivered.
In the instructional video (outstanding resource) Patrick had a P938 from back when they were still being delivered with reasonable triggers. Approximately speaking, in the video he had a roughly 5 lb trigger which came down to a much smoother 3.5 lb trigger.
Well these days Sig is delivering triggers of 7 or 8 lbs and many people are reporting even over 10 lb so it’s a good question, what about the kit on current deliberately-crapped-up-trigger Sigs?
I didn’t measure my starting trigger pull but it had to be 9+ lb. It was also somewhat gritty and quite unenjoyable. I put 100 rounds through it as delivered (zero malfunctions, good on Sig there) and was overall very pleased with it, except for the poor trigger and the ABSURDLY difficult to move safety. The poor trigger still didn’t in any way stop delivering a full mag pretty quickly at 7 yards with all hits good from the standpoint of self-defense, but still, not good.
While the gun is obviously not for bullseye competition or anything like that, still part of my range experience is getting in some nice precision-focused shooting as well as getting speed by being only as accurate as needed. I felt the trigger was costing me an inch or a bit more at a mere 7 yards when being slow and precise. Impossible to say how much more it might have been costing when going as fast as possible. Several inches seems quite plausible. Anyhow that’s where the gun was at.
I only gave 10 minutes polishing to the hammer. It may be that my Dremel, which is a 1 speed, turns faster than the lower setting of Chris’s Dremel. In any case, at 10 minutes I thought it done.
On performing the spring replacements, what an improvement.
I haven’t measured it yet, but I would say 7-8 lb, and – judging relative to handguns in general not competition 1911’s or CZ’s – it’s good quality now. Very pleased with feel. It really doesn’t need more work. A person could well think for carry use one ought to stop right there, and one certainly could.
(Edit: Measured at 8 lb. Both my wife and I find it almost unbelievable that 8 lb feels this good. For anyone reading, if that number sounds like a turnoff, please let me be clear the trigger feels WAY better and I have no doubt it will make a real difference in shooting. Smooth quality vs gritty, clean, definite, and changing in category from “just too heavy” to “absolutely can work with this.”)
My thoughts are that sear spring adjustment might bring it down to the 3.5 - 4.5 lb I’d prefer, but I will have a gunsmith look at that rather than attempt myself. I also wonder if part of Sig’s deliberate heavying-up program may not have included an over-heavy firing pin lock spring, so I plan on getting a Mustang spring and when I bring it to him if my gunsmith considers that worth doing, that’ll be on the table. If not, I’ll be out $4 or so.
Lastly, thought I’d mention that the absurdly-stiff safety problem was completely solved by swapping out the safety detent spring with a Mustang part. The Sig spring puts absolutely insane pressure on the detent. I suppose the purpose was so ladies can toss the 938 into their purses and rummage about without fear of the safety lever moving. That sort of thing is probably is why they heavied up the trigger as well. (At least Rock Island cited non-holster carry as to why they heavied up their Baby Rock trigger, delivered to me at 13 1/4 lb. Not a good gun overall, not worth even its low price. In contrast the Sig is worth the money IMO.)
Will report back after the gunsmith work or evaluation.