So I gave in and bought a Sig X Ten, I already had the 4" M&P 10mm so a side by side comparison at the range was in order.

Just handling them the Sig is roughly 5-1/2 ounces heavier and an inch longer than the M&P but subjectively it feels like a bigger difference. The only way I can describe it is like an all steel 5" government 1911 compared to a lightweight commander sized. The Sig is also more nose heavy than the Smith.

Shooting them I actually prefer the ergonomics and grip shape of the Smith. I prefer the grip texture of the Sig, especially shooting heavy loads. The more aggressive grip texture of the M&P can be felt shooting heavy loads and it can be a little grating. The trigger on the Sig is much better, it's lighter and does not have the long take-up like the Smith. Initially I was shooting smaller groups with my Smith than I was my Sig, but that changed the more I shot the Sig and the group tightened up to be slightly smaller than the Smith.

Reliability, the Sig was 100%, the Smith not so much. Ammo shot was Blazer brass 180gr FMJ, Aguila 180gr. FMJ and Underwood 220gr hardcast. The Sig really likes the Aguila shooting the tightest groups of the night with it. While I like the grip shape of the Smith, the Sig handles the heavy 220gr. Underwood loads much better. The wider grip soaks it up and the grip texturing isn't abrasive.

The Smith, well it disappointed once again. I seemed to have fixed the consistent 2nd to last round in the magazine jam, now I'm getting random failures to feed. 2 failures with Blazer and 1 with Aguila. Previously is would jam the nose of the second to last round in the magazine against the barrel hood. Tonight is seemingly random with the base of a live round still held in the magazine, the case being perfectly horizontal and the nose of the bullet jammed against the feed ramp. Slingshotting the slide would eject the jammed round and chamber a new one. One thing I also noticed while shooting the Aguila was deep indentations in the middle of the fired cases.

Disappointing, 2 weeks ago 3 of us fired 400 rounds of 7 different ammo types including Blazer brass that was shot tonight without incident. First time ever I was Abe to run a full magazine thought it without failure. The gun has been sent back to Smith twice for warranty repair with the barrel being replaced once, I've replaced the recoil spring with a Galloway Precision 24lb. until, replaced the mag spring with Wolff Extra Power springs for the M&P .45 magazines, polished the feed ramp and chamber myself. I thought I had it fixed but with 3 failures in 150 rounds tonight, I still can't trust it.

Really annoying in that I thought the Smith was reliable and ordered a custom holster for it yesterday. I'll be calling them in the morning and see if I can have it made up for the Sig instead. The lighter weight and smaller proportions of the Smith would make for a better carry gun, I just can't trust it. I am happy with the Sig, 100% reliable, a good trigger and it handles heavy 10mm loads well.

Thanks for the report. Gives some good insights on the 2 pistols. Sorry your trouble's continue for the Smith. Just isn't like them to put out a pistol that doesn't work.

I understand the frustration that led to getting the X Ten. I recently went the opposite direction (tried a X5 Legion and it just didn’t work as well for me as my M&Ps do).
From two 9 Pros to a Compact to the 4-inch 10mm … I’ve always had good performance out of the M&Ps.

I hope the X Ten proves reliable and serves your needs for many years.

I really wish Sig would release an X-Ten in a compact footprint. My use-case is as a trail gun, where size and weight is a huge factor, and the X-Ten as currently available is just too big. I like what they did with the grip...it's a comfortable gun to hold, and it has all the familiar characteristics of any other P320...but it has to fit in with my backpacking loadout and as currently available it does not.

I've handled the M&P 10mm. They shoot ok, but I've never really cared for the M&P. I don't like the grips, and the triggers are gosh-awful. The last two I handled felt like somebody dumped a bucket of sand inside the gun. Couple that with the ongoing reliability issues that you've been reporting with yours, and I have zero interest in owning one.