Slide moves to rear when trigger is pulled - MP-Pistol Forum

Slide moves to rear when trigger is pulled

This is a discussion on Slide moves to rear when trigger is pulled within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; I just bought a slightly used M&P9 full size. It is an older model, serial #MPV####. Ithe previous owner said that a gunsmith did some ...


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Old July 7th, 2015, 04:39 PM   #1
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Slide moves to rear when trigger is pulled

I just bought a slightly used M&P9 full size. It is an older model, serial #MPV####. Ithe previous owner said that a gunsmith did some work to the trigger (not sure if this is a factor, but mentioning it anyway).

When I pull the trigger completely to the rear, the slide will move rearward as well, probably close to a full 1/8", just to the point of being out of battery. This occurs after the sear has tripped the striker - the slide only moves when the trigger reaches about its most rearward travel and reaches the trigger stop.

I have a few other M&Ps so I was experimenting swapping slides around, and it seems to be something with the slide causing the issue. Putting different slides on the new frame works fine, but the new slide on other frames will recreate the problem - the only exception being the new slide on my frame with the Apex Flat Face trigger and FSS. This trigger of course does not move far back enough to cause the slide to move, but all my frames with factory triggers will make the slide move.

I searched to see if this issue occured with anyone else, and the only instance I found said that it might be the trigger bar dragging against the striker block.

Anyone have any ideas/suggestions?
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Old July 8th, 2015, 06:19 AM   #2
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Call S&W customer service.
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Old July 8th, 2015, 01:18 PM   #3
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"Gunsmith", yeah... there a dime a dozen. REAL gunsmiths, not so common. Call S&W, this may cost you before it's all said and done.

Did you not notice this oddity before you made payment? Just curious...

EB
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Old July 8th, 2015, 01:57 PM   #4
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I did not notice it when I bought it - I didn't really work the trigger when I got it, I just noticed it when dry firing when I got home.

Anyway, after I posted I decided to tinker with it a little more. First, since I had heard that S&W updated the striker at some point I wondered if the old model striker in this pistol might be the issue. I swapped the old one for a new one, and there was no difference.

I had a spare striker block from when I swapped in an Apex USB on another pistol, so I thought I would give that a try next. When I removed the aftermarket rear sight I had one of those "Eureka!" moments.

The "gunsmith" that replaced the sights kinked the striker block spring very badly. It had slipped past the little disk that holds it over the striker block and when the rear sight was put on about 1/16" of the spring was jammed under the rear sight and between the sight and dovetail.

I replaced the striker block and spring with the spares I had, put everything back together, and tried it out.

And it works just as it is supposed to now.
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Old July 9th, 2015, 11:25 AM   #5
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Quote:
Originally Posted by jdesro View Post
I did not notice it when I bought it - I didn't really work the trigger when I got it, I just noticed it when dry firing when I got home.

Anyway, after I posted I decided to tinker with it a little more. First, since I had heard that S&W updated the striker at some point I wondered if the old model striker in this pistol might be the issue. I swapped the old one for a new one, and there was no difference.

I had a spare striker block from when I swapped in an Apex USB on another pistol, so I thought I would give that a try next. When I removed the aftermarket rear sight I had one of those "Eureka!" moments.

The "gunsmith" that replaced the sights kinked the striker block spring very badly. It had slipped past the little disk that holds it over the striker block and when the rear sight was put on about 1/16" of the spring was jammed under the rear sight and between the sight and dovetail.

I replaced the striker block and spring with the spares I had, put everything back together, and tried it out.

And it works just as it is supposed to now.
Good job, congrats!
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Old July 9th, 2015, 01:34 PM   #6
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Sounds like your own the way to being your OWN gunsmith!!! Congrats!!

EB
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Old August 17th, 2015, 07:51 PM   #7
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Check and make sure something didn't get in the striker safety plunger hole. If something goes into the striker hole and falls over into the plunger it can jam the plunger holding it so the plunger lift nodule on the trigger bar will push the slide.
Hope this makes sense.
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