Update 4 at Top - 4" M&P 10mm IT WORKS!

[Farmer17]

I haven’t seen a lot of new posts from people saying they have problems with their 10 mms.
Does that mean the factory is getting things straightened out, or does it just mean people stopped buying them for now?

I bought a 4" M&P 10mm in February of this year and it has been awesome in every way. Great ergos, very accurate, perfect reliability, and lighter than expected recoil. The trigger is the best of any factory striker fired gun I have ever shot. Its better than all my other centerfire semi autos except my Springfield 1911 .45. I hated the looks of the tall suppressor sights but they really help my shooting.

 

[Seth_Alaska]

10mm Magazine Issue

100% a magazine issue. Tried heavier Springer Precision magazine springs and 22-24# slide spring. Still got FTF on heavy Underwoods. Inadequate surface area & friction on the feed lips. Recoil is causing the next round to slip forward in the magazine, then slide return rockets it high on the feed ramp. Followed this advice and slightly abraded the inside of the feed lips, so far 50 hot hard-cast with no issues.

I have a 4.6 that I also had the infamous nose up jams with full pressure underwood loads, I did the mag spring and recoil spring, polished the feed ramp, it helped but I still had occasional nose up jams, I reinstalled the original mag spring but kept the heavier recoil spring. I made one little modification to the mag and it's been 100% ever since. 220gr underwood no problem. What I did was take a piece of 220 grit sand paper and carefully sanded the inside of the mag feed lips perpendicular to the bullet case feed direction to roughen the inside surface , that increases the case to mag lip friction enough to keep the round where it should be during recoil. It has been 100% reliable with hundreds of underwood rounds through it. hope somebody else tries this I would like to know if it works for you also.

 

[Euclid]

I used springer extra power springs and it entirely fixed the FTF issues. I has to be a mag spring issue.

 

[Euclid]

Which high power Wolff spring are you guys using? The. One for the 10 round or 14 round 45 acp magazine?

 

[S&WForty]

I used springer extra power springs and it entirely fixed the FTF issues. I has to be a mag spring issue.

Can you give me more details? Where did you buy them? What is the P/N? I just bought a brand new 4" model, and while shooting ~135 rounds, I had next-to-last round FTF occur three times.

I was shooting S&B 180gr FMJ.

My habit when shooting FMJ is 5 rounds at a time, so for the first firing of the new 10 mm, I just loaded 5 rounds. That was the first occurrence of FTF. For the next ~130 rds, all but one or two loadings were full 15+1, and it occurred twice then.

At least I know I can get off 13 shots. That's double what my Shield 40 can do.

EDIT: Did you use Springer Precision 11 coil, SP0168?

Or SP0436? I see this one listed on Springer's site for 10mm, but I have seen other owners elsewhere reference the 0168.