weak primer strikes?? - MP-Pistol Forum

weak primer strikes??

This is a discussion on weak primer strikes?? within the MP Gunsmithing forums, part of the Smith & Wesson MP Forum category; My 4.25 inch M&P 9 has developed a situation regarding primer strikes. The situation is random and the fail to fired rounds show a good ...


Go Back   MP-Pistol Forum > Smith & Wesson MP Forum > MP Gunsmithing

Reply
 
LinkBack Thread Tools Display Modes
Old July 28th, 2016, 12:25 PM   #1
Member
 
Join Date: Jul 2014
Location: east tennessee
Posts: 112
weak primer strikes??

My 4.25 inch M&P 9 has developed a situation regarding primer strikes. The situation is random and the fail to fired rounds show a good indentation. Some of them will fire after a second strike.

The primers are CCI and Winchester. All primers were seated by hand and felt good.

Striker channel is clean and dry. Problem started after approximately 1500 rounds. The OLD 1911 firing pin pencil check shows a full length pencil will barely clear the muzzle. I do not know if this is sufficient striking force.

Is it reasonably to think that I need a new striker spring? If so, can you recommend a source.
donhudd is offline  
Old July 28th, 2016, 01:51 PM   #2
Senior Member
 
Rick M's Avatar
 
Join Date: Nov 2008
Location: Weeki Wachee, FL
Posts: 1,862
Quote:
Originally Posted by donhudd View Post
My 4.25 inch M&P 9 has developed a situation regarding primer strikes. The situation is random and the fail to fired rounds show a good indentation. Some of them will fire after a second strike.

The primers are CCI and Winchester. All primers were seated by hand and felt good.

Striker channel is clean and dry. Problem started after approximately 1500 rounds. The OLD 1911 firing pin pencil check shows a full length pencil will barely clear the muzzle. I do not know if this is sufficient striking force.

Is it reasonably to think that I need a new striker spring? If so, can you recommend a source.
If you call S&W, they'll probably send you a new striker assembly for free.

I don't know if that's the problem, as my oldest M&P9 (made 07/2007) is still on it's original striker assembly, and functions fine with both factory ammo and my reloads.

Last edited by Rick M; July 28th, 2016 at 01:54 PM.
Rick M is offline  
Old July 28th, 2016, 07:35 PM   #3
Senior Member
 
Join Date: Jan 2016
Location: Central Maine
Posts: 763
Have you pulled the assembly, disassembled, and cleaned it? That would be the first thing that I'd try. It won't take 5 minutes if you know the drill. Be sure to not only clean the assembly but the area in the slide and into the breechface.
BrianK is offline  
 
Old July 28th, 2016, 10:17 PM   #4
Member
 
Join Date: Jul 2014
Location: east tennessee
Posts: 112
Quote:
Originally Posted by BrianK View Post
Have you pulled the assembly, disassembled, and cleaned it? That would be the first thing that I'd try. It won't take 5 minutes if you know the drill. Be sure to not only clean the assembly but the area in the slide and into the breechface.

That was the very first thing I did. It was clean and dry
donhudd is offline  
Old July 29th, 2016, 03:06 AM   #5
Junior Member
 
Join Date: Jan 2016
Location: western NH
Posts: 22
I had the same issue with my SD9VE, called S&W and they sent a new striker assembly right out..no charge. I did end up using my old plastic sleeve as the new sleeve was way too tight
Norm
star1 is offline  
Old July 29th, 2016, 03:06 AM   #6
Member
 
Join Date: Oct 2012
Location: Virginia
Posts: 256
I had an issue with mine that sounds similar to yours.

Someone here clued me in to what he called a "timing issue".

The sear was releasing the striker before the trigger bar had lifted the striker block fully out of the way. The striker would make it past the striker block, but contact with the striker block would slow the striker down enough to cause it to fail to set off the primer.

I got the little indentations in the primer, but no bang. I had an APEX kit in mine and the striker block had the pronounced rounded edges rather than the sharper edged of the S&W unit.

I'm not saying that's your problem, but it could be.

Also, if your M&P is lifting a brand new pencil up enough to clear the muzzle that's more than mine would do. While I was having issues I got out my Glock, XDM and Colt 1911 pistols and pencil tested all of them. The Glock and M&P pistols were comparable in how much the pencil moved (or how little). The XDMs would launch the pencil up out of the muzzle for a couple of feet or so. The 1911 would bounce it off the ceiling, or across the room.

Good luck with getting it straightened out. It's always disheartening to have a gun you like and carry go down and not be dependable anymore.
M1A4ME is offline  
Old July 30th, 2016, 09:13 AM   #7
Member
 
Join Date: Jul 2014
Location: east tennessee
Posts: 112
Quote:
Originally Posted by M1A4ME View Post
I had an issue with mine that sounds similar to yours.

Someone here clued me in to what he called a "timing issue".

The sear was releasing the striker before the trigger bar had lifted the striker block fully out of the way. The striker would make it past the striker block, but contact with the striker block would slow the striker down enough to cause it to fail to set off the primer.

I got the little indentations in the primer, but no bang. I had an APEX kit in mine and the striker block had the pronounced rounded edges rather than the sharper edged of the S&W unit.

I'm not saying that's your problem, but it could be.
Also, if your M&P is lifting a brand new pencil up enough to clear the muzzle that's more than mine would do. While I was having issues I got out my Glock, XDM and Colt 1911 pistols and pencil tested all of them. The Glock and M&P pistols were comparable in how much the pencil moved (or how little). The XDMs would launch the pencil up out of the muzzle for a couple of feet or so. The 1911 would bounce it off the ceiling, or across the room.

Good luck with getting it straightened out. It's always disheartening to have a gun you like and carry go down and not be dependable anymore.
This post got me to thinking. I put some white-out on the striker block , re-assembled and dry fire a couple of times. Dis-assembled and saw that the strike block was only being touched on the rounded edge next to the center of the slide. The trigger bar was nearly bypassing the block. A little careful adjustment to the trigger bar tab got contact toward the middle of the block. Hopefully this will solve this issue for me, if not I will follow up.

Last edited by donhudd; August 1st, 2016 at 01:29 PM.
donhudd is offline  
Old July 30th, 2016, 12:11 PM   #8
Member
 
Join Date: Oct 2012
Location: Virginia
Posts: 256
Good! Hope you found it.
M1A4ME is offline  
Old August 24th, 2016, 04:05 PM   #9
Member
 
Join Date: Jul 2014
Location: east tennessee
Posts: 112
weak primer strikes

My previous efforts were not successful. Customer Service is sending a new striker assy. I have ordered extra-power springs from Wolff just to be sure I can continue to use up my CCI primers.
donhudd is offline  
Old August 25th, 2016, 03:23 AM   #10
Member
 
Join Date: Oct 2012
Location: Virginia
Posts: 256
When I was having problems with mine someone suggested replacing the M&P striker springs with Glock striker springs as they are supposed to be stronger springs.

I did that (they fit) but it didn't help. Once I got my pistol running again I just left the Glock striker spring in it.

Last count I had 350 rounds through it with no failures. Prior to fixing it I was having 2 to 3 failures to fire out of every 15 round magazine.
M1A4ME is offline  
Old November 15th, 2016, 03:07 PM   #11
Member
 
Join Date: Jul 2014
Location: east tennessee
Posts: 112
weak primer strikes

I installed the new striker assy (no charge from Customer Service) and have not had a fail to fire in about 500 rounds of mixed CCI and Winchester primed rounds.
donhudd is offline  
Old November 16th, 2016, 03:51 AM   #12
Member
 
Join Date: Oct 2012
Location: Virginia
Posts: 256
That's great. Having confidence in your carry pistol is absolutely necessary.
M1A4ME is offline  
Old November 20th, 2016, 04:11 AM   #13
Member
 
XRacer's Avatar
 
Join Date: Jun 2011
Location: Akron, Ohio
Posts: 175
Glad to hear you got the issue resolved. I just got in touch with S&W before the election and somehow got them to send me a striker assy for both my 9C and 45FS, though I just wanted to have them as peace of mind. Now that Trump won I'm not quite as concerned about having spares(also got a recoil assy for both). I tried the pencil thing with my 9C and was very disappointed, would hardly get halfway out of the barrel. Then I put the non eraser end in and it shot out about two or three feet...
XRacer is offline  
Reply

  MP-Pistol Forum > Smith & Wesson MP Forum > MP Gunsmithing

Thread Tools
Display Modes




Powered by vBulletin 3.8.7
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright © 2006-2012 MP-Pistol. All rights reserved.
MP-Pistol is a M&P pistol enthusiast forum, but it is in no way affiliated with, nor does it represent Smith & Wesson Holding Corp. of Springfield, MA.