Sig sauer jams with 1 round in mag.

Magazine spring is getting weak, put in a new one.

I know this might sound strange, but some times manually fed rounds will not cycle normal. I've seen this happen numerous times with various firearms, including the P229. I would take it out to the range and try running a magazine to see what it does.

Coincidentally, a guy I know who works for a high profile security agency was asking me about the same scenario this afternoon regarding his almost brand new P229. I think he said they were factory Gold Dots though, not that it matters. Anyway, he should be calling me this weekend to give me the scoop, as to whether or not they cycled reliably when fired.

GS

I have never heard of cycling a round through a pistol after cleaning. I do rack the slide several times to see if envy thing feels right and spread the lube. Usually there is something on the rocks going while I clean my firearms, so I'll leave the mags empty.

Usually when the gun won't feed the last round its the magazine spring getting weak, but I agree with you that if it does this with all the mags its not the mag spring. But I still think this is magazine related.
You wrote that they are factory mags. Well I have no first hand experience with this but I did hear that Sig started using a different manufacturer for their mags besides Mec-Gar and this may be the problem.
If you have a brand new gun with three brand new mags and none of them will load the last round in the mag you have a warranty issue in my opinion.
Perhaps others will expand on this more than I can.

I had the same issue with a new Sig 1911 Nitron that I bought about six months ago. Initially I thought it was the OEM Sig mags so I bought three new Wilson Combat and had the same problem. I even tried my son's SA mags with the same results. It was only the last round in the mag, but occurred with EVERY mag. Finally I sent it back to Sig and they polished the feed ramp, tested it and said they put 50 rounds through it without a problem. When I got the gun back, it was much better but the problem persisted on maybe two out of every five mags. To make a longer story short, I finally came to the determination that it was ME causing the problem. This was my first 1911 and I didn't realize how touchy they could be about ever so slightly touching the slide as the gun cycled, especially on that last round when the spring isn't compressed as much. I modified my grip a bit and the problem disappeared. I know your p229 isn't a 1911 and your problem likely has a different cause, but it was the first time I've ever heard of another person having the exact problem and somewhat coincidentally with a Sig. Good luck and sorry about being so wordy.

Try releasing the slide by using the slide lock lever. Remember that magazine spring force is at its lowest when you're down to one round. It may be sensitive to a slight diminution in forward slide velocity. Releasing it by way of the slide lock lever should make sure you get full slide speed.

That said, be careful if you're running live ammo through the gun at home! I humbly suggest buying some snap-caps or making some dummy rounds (easily done if you reload) so that you don't risk an AD while function-checking your gun after cleaning.

Go shoot it and get back to us.

As others have said, try recreating the problem at the range under actual firing conditions. Most likely, the problem you are experiencing while manually cycling will disappear when the gun is doing the work, at the designated speed and force that it was meant to be done. Sigs are typically a little tighter out of the box than other modern common handguns, and manually cycling can easily cause hangups.

If the gun has this same problem when actually firing at the range, then it needs a trip back to Sig in New Hampshire.

Also, I second the recommendation to buy snap caps. Manually cycling loaded rounds through a gun is not a safe practice. Plus, with snap caps, you can safely practice trigger pulls and malfunction drills all night while watching your favorite TV show!

TBH said:

I have never heard of cycling a round through a pistol after cleaning. I do rack the slide several times to see if envy thing feels right and spread the lube. Usually there is something on the rocks going while I clean my firearms, so I'll leave the mags empty.

Click to expand...

If I'm going to rely on gun for defensive use I do NOT clean the gun after testing it. Do people do otherwise?

Shoot it and see what happens . If it has weal mag springs then you will find out .

I put no faith in manual racking to tell me if a problem or if a problem solved . Slide needs to travel at shooting speed

If I'm going to rely on gun for defensive use I do NOT clean the gun after testing it. Do people do otherwise?

Click to expand...

If Iam going to carry I will try to fire 1 or 2 rounds after cleaning to make sure all good. I may run a patch down barrel after words but that it.

You're overthinking this. Dont stress about it untill it actually jams on the firing line.

OEM SIG mags used to be made by MecGar out of Italy. Recently, they switched to some cheaper alternative, at the expense of quality & reliability.

Don't think for one second that your new SIG branded mags are good to go just because they're factory. Buy some MecGars and carry on.

Try releasing the slide by using the slide lock lever. Remember that magazine spring force is at its lowest when you're down to one round. It may be sensitive to a slight diminution in forward slide velocity. Releasing it by way of the slide lock lever should make sure you get full slide speed.

Click to expand...

This.

Plus 2 on the above post

...

I guess that's possible but I doubt it I have 3 mags and all do it and still feel pretty stiff.

Click to expand...

...

And the chances of all 3 mag springs being worn out.. ? (not the problem IMHO)

My bet/guess is that you are, or were, hand/riding the slide back down and way back when, I got the same jam, if you will, and took my gun back to the dealer/clerk and he watched me do it and said, that's what's wrong, you need to allow the slide to release at "full force" - either by using the slide release lever or by hand using the sling-shot method - pull the slide "all way back" and then "let it go" - "full force".

Never have had this occur again i.e. jam with one bullet only or a few, as you described since that day of hand-riding the slide down lightly or easily diminishing the force required, and is right, for full chambering.

"Slam that bullet in" every time, anytime, my clerk said and he was right.

"Full force" is how the gun was made for and full force "chambering" is part of the designed drill, so to speak


Ls

Ps.. And, possibly, re-load out of spec or some out of spec new ammo can cause similar type loading jams

I would not call it a jam until it actually does it while firing.

Not sure if that's important or a problem.