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I should have followed up on this back in June. Talked to Sig and they suspected the magazine not being fully seated. Since they upgraded the magazine latch, you definitely have to pop the magazine into place with a little extra force. This solved our problem. Together, we have run at least 1,000 rounds through this P938. We have had one FTF with a clear detent in the primer so this was an ammo problem. We have also had one FTE not sure why. Not perfect but 1 out of 1000 unexplained failures is acceptable to us.

My wife fired a P238 before buying this P938. She didn't notice much difference although the 9 mm is a bit snappier. The only complaint she has with the gun is the trigger tends to pinch her finger. I have fat hands. The trigger doesn't bother me at all but I get a callus on the web between my thumb and forefinger from where the hammer hits.

BTW, for a short barrel, this is an amazingly accurate gun.

I have been feeding my CZ a steady diet of Magtech and I like it. Performance has been consistent. I've also shot a lot of Perfecta and never had any trouble with it either. I prefer the Magtech but the Perfecta won the price challenge. Today was the first time I have fired both at the range in cloudy conditions. The Perfecta has a pronounced muzzle flash! Neither round seemed to help my problems with my Sig.

Here it is two months and 400 rounds later and we are having problems again. The last 3 range trips have each had a problem. May 17, midway through 50 rounds, my wife experienced a failure to extract. For our May 24th trip, I did a thorough cleaning and changed from Magtech to Perfecta. About halfway through 50 rounds, my wife had a failure to fire with no primer strike. My wife always feels like it is something she is doing but short of not getting the magazine seated, I don't know what it could be. Today, I fired two magazines (14 rounds), reloaded the magazines and fired, on the first round of the second magazine, I got a failure to extract.

I guess I'll call Sig again tomorrow and see what they say.

Finally had the opportunity to take the repaired Sig P938 to the range. Very pleased. Almost 100 rds of Magtech FMJ and 21 rounds of Hornady Critical Defense. Pistol was flawless (can't say that about the shooters).

The pistol is back from Sig. Very quick turn around. The cleaned the firing pin channel, replaced the mainspring, and upgraded the magazine latch. They reported test firing with ball and hollow-point with no malfunctions. Here's hoping my wife and I can get to the range in the next few days and run a 100 rounds or so.

SigM4 wrote:...Couple follow up questions. When you are cleaning the gun have you ever put oil on the firing pin or firing pin channel? If so don't, it will attract crud where you don't want it to be. If not then obviously something else going on.

No - and when not being fired or cleaned, we keep the Sig in a zipped pistol pouch.

Also, just as best practice, always drop the mag when done shooting before releasing the slide. This doesn't mean you shouldn't check the chamber, but would almost certainly avoid the issue you experienced above.

Pretty sure the wife drops the magazine before releasing the slide. The slide release is very difficult to push so we both just pull the slide back, either without a magazine or with a loaded magazine.
I talked to the wife about being sure the weapon is clear before putting it away. I'll probably check it anyway before putting it in the range bag anyhow -- just my way.

Thank you all for the help.
I called Sig and they created an RMA and a shipping label.

This is a brand new gun - never even on display before we bought it. Looks like I will call Sig in the morning.

I'm new to handguns and don't know quite what to do with this problem.

The last 3 trips to the range, we have experienced malfunctions and I don't know whether or not to blame the gun, the ammo, or the operator.

Problem 1: The most recent trip, we had 2 failures to fire. My wife alerted me that her Sig P938 did not fire. I removed the magazine and ejected an intact round. There was no firing pin strike on the round. I then inserted the magazine and on the second round, the hammer went forward without a bang. I pulled the hammer back, pulled the trigger, and the round in the chamber fired. We proceeded to run over 50 rounds through the gun without a repeat of this problem. We had this problem a couple of times when the gun was brand new but I attributed it to cheap ammo and/or a break-in period. We have run over 450 rounds through the gun. We are using MagTech 115g brass. My CZ 75 Compact has eaten over 1,000 rounds of this same ammo with absolutely no problems. I had just cleaned the Sig before this trip.

Problem 2: Also today's trip. When my wife was done and put the Sig away, I did the routine safety check and ejected a spent cartridge. My wife swears the gun locked open on the empty magazine and she released the slide lock to store the gun. This problem may be related to problems in the previous 2 trips to the range. For today's trip, we tried 2 things to eliminate this problem. First, I cleaned the gun and used my pocket knife to scrape the inside of the extractor. Second, I worked with my wife on racking the slide for the first round, thinking she may not have released it correctly resulting in the extractor not catching the rim of the round.

Problem 3: On 2 previous trips to the range, the Sig failed to extract the expended first round.

This gun was purchased to be my wife's EDC. I'm having trouble trusting it at this point. Do we contact Sig Sauer, or do we take it to a local gunsmith (we had planned to have a local gunsmith install an aftermarket trigger because the original equipment trigger pinches my wife's finger)?

Sig Sauer?

Gunsmith?

Thanks in advance for your help.