I bought 4 gray ones. They fit a little tighter than the OEM magazines. They have less wiggle in them when in the receivers. I loaded up 35 in all four and I had no issues. I am happy with them. Waiting on Thril to make some more black ones!

These magazines are great! They feel much more sturdy than my factory SIG magazines and operate 100%. Bought a few of these when I first purchased my firearm; shot probably 500 rounds through one magazine with zero malfunctions so I went ahead and purchased 6x more. You can't beat the price and IMO these are the best magazine choice for the MPX.

I’m satisfied with my purchase, I would recommend this product.

Fits the mag well snug and feeds reliably. Just like it suppose to.

Thril's MPX magazines operate as flawless as the factory magazines and at half the price plus a few extra rounds isn't bad either. Highly recommended.

I am so happy that there is finally an alternative to the original equipment magazines for my MPX. These Thril magazines look slick and operate just like the ones that came with my MPX for a fraction of the cost. I've only been to the range once with these, but zero problems.

LOVE HOW IT FEELS IN THE HAND AND THINNER PROFILE

I own two Sig Sauer MPXs a carbine and pistol! The issue with the MPX was that the only source of Magazines was through Sig (Lancer), although these magazines are good but their price was prohibitive. Late last year I found out that a manufacture THRIL was offering their own MPX magazines, I decided to give them a try so bought two! This was a mistake, I should have bought more! Yes, they prove too be awesome. Since I bought these two mags I’ve ran hundreds of rounds through them with no issues period. I found them to be as good as the Sig Sauer magazines that cost twice as much! Another Plus is that they actually look better than the Sigs mags. I bought additional five THRIL MPX magazines as soon as they were available last week!

Worked great in my sig mpx 9mm. Only small gripe is that they feel a little tight going in the magazine well. No misfeeds or jams. Perfect alternative to the oem mags at great savings. Highly recommend.