Strange issue with M&P 9mm today at the range.

[rborst]

Today at the range my pistol failed to lock the slide back after the last round when using all 5 of the magazines I brought with me. This occurred roughly 1/3 of the time for each mag.

The magazines all have fewer than 200 rounds through them so I doubt they are the issue.

The pistol has had around 400 rounds since its last cleaning but has sat for around 3 months with no additional lube. Could it be due to a dry gun and cold weather (around 30 degrees)? Ammo used was WWB and I experienced no failures to eject.

Any thoughts?

[hkman]

My guess would be weak ammo. Try different ammo in those same mags and I'll bet it locks the slide back. WWB has been known to be on the weak side.

[Beat Trash]

Also check to ensure none of your fingers are near the slide release when you grip the pistol.

[Kegger]

You may very well be limp-wristing.

Any other guns ever do this to you before?

[rborst]

It is very possible that my grip was affected by the cold. This was towards the end of a long range session and I was without gloves. Ill pay particular attention to it next time and report back if the problem persists. Thanks for the help.

[payj]

Like the others have said, weak ammo or limp wristing.

[cj5_dude]

I carry an M&P on duty and when I shoot at the range I frequently have my long thumbs over the slide stop and hold it down unintentially. My hands do it on Glock's too. My suggestion is grip though it could be other causes.

[Jim D]

I'd recommend lubrication as being more necessary that a rock solid grip. Lube it up, shoot the same ammo, and see what you get.

[texag]

Happened rather often with mine, too. It's always been because I've got my thumb over the slide release. It takes some work on your grip and a lot of dry reps, but I eventually got it right. It's a very rare occurrence now.

[300WM]

My guess would be weak ammo. Try different ammo in those same mags and I'll bet it locks the slide back. WWB has been known to be on the weak side.

On the contrary, WWB is one of the most consistant factory ammos out there. I use it for 50 yd bulls eye when I don't reload. Groups are very consistant for factory. I have five different makes of 9mm and it is flawless in all of them.

Does not sound like a limp wrist, or you would be having trouble other than just the last round, unless you have that unmeasurable limpness that will let the slide cycle, but not lock after the last round.

Sounds like a digit is hitting the slide release while shooting or your mag followers have some kind of dings or burrs on them, or there is residue where the follower tops out.

I would go after grip first, followers second (clean inside mag with super light film of good oil) clean and lubed slide third, hotter ammo fourth.

Do one, two, and three and try same ammo before trying a hotter ammo.

As far as the quote, not saying you are wrong, you may have a pistol WWB does not work well in.