SIG P938 Failure to Feed?

That happens all too often on some new pistols, especially those with tight tolerances. A prime example is Kahr, who even puts in instruction manuals to give them at least a 200-round break in period. 500 rounds though is a lot. I'd clean and lube the Sig up and run a few more boxes through it. You may also want to check and see if it happens more with one magazine than another. Beyond that, it may need to go back to Sig.

I have a P238 HDW and a P938, each with regular and extended magazines. I've never had feeding issues.

I also have not experienced any feeding problems with my P238.

With that number of rounds through the pistol i would contact Sig, my P 938 has never had a malfunction and i have only 2-300 rounds through it. For a carry pistol i would want the factory to give it a through inspection and possible repair.

Did you clean and lube before your first range session? If you did, It needs a trip back to Sig.

If you didn't, its due for a proper cleaning to remove the factory goo. Then try again. But as others have said, if it hasn't smoothed out in 500 rounds, something isn't right.

When an issue crops up like this, the first thing to do is Change The Ammo.

500 rounds of the same ammo means you can't trust the ammo, not the gun. Use a different maker and switch up the grain weight to something else, like 90.

Go shoot 100 rounds of that and see if things change. The gun is broken in to most expectations, what needs to be determined is if the ogive and gilding on the nose of the 115 gr rounds is the problem, or the gun.

To do that, you change the ammo. Two or three times, if necessary. If they ALL show the issue, you have done your due diligence and it would be hard to fault you or the ammo makers. It would be generally accepted as a gun issue.

Rare, tho, since the adoption of a 9mm specific extractor and recoil spring for production two years ago. The early versions did have some issues with extraction failure.

Most of us shooting the P938 - and for that matter, any small 9mm - have read and possibly experienced that some loads simply won't function reliably in the guns. It's asking a lot, as the variety of powders and grain weights expand the range of dynamic factors the engineers strive to accept. There are physical limits - just the same as for the AR15. With recoil operated guns, the shape of the ammo nose is critical to feeding, and there is no guarantee that any one of them is perfect for that particular gun. The makers adopted a profile that accommodates about 100 others on the market, from 6" duty guns to micro pocket 3" pistols with half the frame weight.

It's complicated.

Go shoot something different and see if things don't work out. There are some who insist their guns must be able to shoot anything they shove into the chamber, but it's not reality. Smaller framed guns simply won't, same as 1911's not being compatible with hollow points or wadcutters.

I would try a different ammo, then send it in. I found out that my p938 had problems feeding Winchester 124 grain NATO. The extractor seemed too tight for the thickness of the case rim. In some cases, I couldn't even force the slide forward.

I switched ammo and it went away. It had no problems with 124 grain non-NATO, nor did it have problems with wwb 115 grain. Just the NATO had probs

I've never experienced what the OP describes with my P938 Extreme. It's my EDC and handles 115 gr FMJ and JHP from various manufacturers using both 6 and 7 rd mags without any problems. I agree with the comment that it needs a thorough cleaning and lubrication if it went to the range straight out of the box. If that's not the case, contact SIG.

My wife's p938 will do this when the feed ramp gets dirty after a couple of hundred rounds. Cleaning it clears the problem. I've decided to clean it after every range trip even if it's only 20 rounds!