Bad striker assembly? - MP-Pistol Forum

Bad striker assembly?

This is a discussion on Bad striker assembly? within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; So, I just got the APEX Tactical Competition AEK in the mail today and got right to installing it on my M&P Pro 9L. I ...


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Old April 9th, 2015, 08:10 PM   #1
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Bad striker assembly?

So, I just got the APEX Tactical Competition AEK in the mail today and got right to installing it on my M&P Pro 9L. I decided to start with the USB install which requires removal of the rear sight. WOW! I beat on that thing for an hour before I got it to budge! I've installed a USB in another M&P and the sight was no where near this difficult to remove. I noticed that when I tried to remove the striker block, i couldn't get it to come out without a rearward nudge on the striker. Wasn't sure if this was normal so I proceeded. When putting the USB in, the same thing....it wouldn't seat until I pushed the striker rearward and then an audible "snap" and it seated.

With the USB installed and that super tight rear sight back in, I function checked the USB. It does NOT work. The only way it will positively block the striker is by pressing the striker back a little until you hear the USB "seat". Then it blocks the striker correctly. Press and release the USB and it unseats and will not block the striker. I know that if you press and HOLD the USB the striker should be free to move. All I have to do is press the USB and release, (it does spring back a little) but does not actually block the striker, allowing it to move freely.

I went through the heartache of reinstalling the OEM striker block and the same problem. So, I took the striker assembly out of my M&P 40 and tried it. Now, both the OEM striker block and the USB function correctly. I'm not sure what exactly has happened but it appears to me I've got a bad striker assembly and I guess I've had one all along. Has anyone else had this problem?
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Old April 9th, 2015, 08:19 PM   #2
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The striker block is working correctly.
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Old April 9th, 2015, 08:32 PM   #3
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Thanks for the reply. I understand the USB is working correctly, it seems to me that the striker is not retracting enough to allow the USB to fully engage and "block' the striker. I'm not sure exactly of the problem, but when I switched striker assemblies, it worked as described by Mr. Lee on his USB Install video. I was wondering if anyone else had this issue?
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Old April 9th, 2015, 10:22 PM   #4
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The striker does not fire from the "at rest" condition you're describing, so there is no reason for the striker block to block the striker there (although many do, some don't due to tolerance stacking). When the striker is retracted, especially to the point of being captured by the sear (a.k.a. cocked or pre-set), the striker is completely blocked, just the way it's supposed to be. Pulling the trigger moves the striker block out of the way first, then rotates the sear to release the striker. If the striker is released without moving the striker block first, then the striker hits the striker block before it ever reaches the primer

Several folks have this "issue", I've have it with several strikers, it doesn't have any negative effect on function.
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Old April 10th, 2015, 07:26 AM   #5
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KRWeiss, Thank you again for helping me sort this out. I'm learning as I go and I appreciate your comments. I agree this "issue" has no effect on functionality of the gun....I've already test fired it and it works perfectly. However, I watched the video from APEX and Mr. Lee is demonstrating the function check at about 4:20 https://www.youtube.com/watch?v=kEaVMxkp8PM
This was the reasoning behind this post. Although it functions the way it is, my concern is if was accidentally dropped could it fire if the striker block is not "seating" properly.

Again, thank you for your comments and please keep them coming!
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Old April 10th, 2015, 02:56 PM   #6
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Again, from your description, the striker block is "seating" correctly.
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Old April 10th, 2015, 04:30 PM   #7
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Cooper, I had an issue with the striker block not holding back the striker. It was on a new M&P 45c. There was some secondary click I heard while examining the pistol. That click was the striker block hitting against the striker as it, the striker block was trying to seat itself. The striker was out of spec, cause you could pull the striker back just a bit, and the striker block would seat and block the striker. I called S&W CS and explained the situation to them. They sent me a new striker assembly free of charge. I installed it and the striker block worked perfectly
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Old April 10th, 2015, 04:40 PM   #8
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To function test the striker block, I do this. When on the pistol range, I load one round in the magazine, insert in pistol, and release the slide, chambering a round. I fire the pistol and the slide locks back due to empty magazine. Now look on the underside of the slide and locate the striker leg. Try to push the leg forward, towards the muzzle. It should not go forward as the striker block is holding it. I submit that if the striker moves forward past the striker block, then that is a safety issue.
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Old April 10th, 2015, 05:21 PM   #9
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Also, in the M&P armorer's manual, replacement of the striker assembly is indicated if the striker is able to be pushed forward past the striker block.
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Old April 10th, 2015, 06:33 PM   #10
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Bullseye250, sounds exactly like what I have going on. I called Smith & Wesson tech support today, explained the situation, and they are sending me a new striker assembly. I must say they were very helpful and courteous on the phone.

Thanks for the info!
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Old April 10th, 2015, 11:39 PM   #11
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What KRWeiss said.
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Old April 11th, 2015, 07:20 AM   #12
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Happy to hear that S&W is gonna make it right. Sounds like S&W concurs with your conclusion (and mine as well) since they are gonna send you a new striker assembly.
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Old April 11th, 2015, 08:23 PM   #13
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Quote:
Originally Posted by bullseye250 View Post
To function test the striker block, I do this...
That's fine, although it's not the way they teach it in their M&P armorers class.

BTW: S&W is sending a striker because he asked for one, not necessarily because of any concurrence on the part of a CS rep. As a general rule, they know fairly little about specific products. When we call them, we simply tell them what we need, and they ship it. Doesn't mean I'm right about anything (except about buying a S&W).
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Old April 13th, 2015, 02:32 PM   #14
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Quote:
Originally Posted by KRWeiss View Post
BTW: S&W is sending a striker because he asked for one, not necessarily because of any concurrence on the part of a CS rep. As a general rule, they know fairly little about specific products. When we call them, we simply tell them what we need, and they ship it. Doesn't mean I'm right about anything (except about buying a S&W).
I have to agree with you here. The girl at CS said she understood the issue and that it wasn't uncommon. However, she admitted looking at a schematic, and was calling out part names until I responded with "thats it!" when the proper part was called out!

Thank you for input on this issue, or my perceived issue I sincerely appreciate it!
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