How I firmed up my manual safety. - Page 3 - MP-Pistol Forum

How I firmed up my manual safety.

This is a discussion on How I firmed up my manual safety. within the MP Gunsmithing forums, part of the Smith & Wesson MP Forum category; They appear to me on my Windows laptop and IPad, so I am don't know why they aren't showing for you. I am also able ...


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Old November 6th, 2012, 04:24 AM   #31
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They appear to me on my Windows laptop and IPad, so I am don't know why they aren't showing for you.

I am also able to view them via Internet using my HTC Evo 4G Android phone at the MP website.


I used Photobucket to post the photos direct links, maybe I will post the links and they will be accessible that way. I used my laptop with MS Vista to post them.

Would other viewers also let me know if the photos aren't showing?

Last edited by Sunset_Va; November 6th, 2012 at 04:31 AM.
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Old November 6th, 2012, 04:31 AM   #32
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Thanks for posting pics, as I can see them without issue.
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Old March 12th, 2013, 06:48 AM   #33
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So, just to make sure I understand correctly, is this the location you filed on the lever?



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Old March 12th, 2013, 07:18 AM   #34
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Quote:
Originally Posted by jsimpson4 View Post
So, just to make sure I understand correctly, is this the location you filed on the lever?
Read the thread...

Quote:
Originally Posted by Sunset_Va View Post
Put the safety lever in a vise and slowly file the lower notch, don't remove too much at one time. Put the lever back on the removed block, insert a drift pin and check the firmness of the safety movement.
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Old March 12th, 2013, 07:32 AM   #35
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Quote:
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Read the thread...
Jason, no disrespect, but I did read the thread. I am unfamiliar with the terminology, as well as safety levers, and that's why I had to ask.
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Old March 12th, 2013, 08:05 AM   #36
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I just got a new 40c with thumb safety and found the safety lever positions very vague. I was pulling out the sear housing block to diagnose and file down the safety lever notches if necessary when I found the real source of the problem. The safety detent wasn't able to slide in the sear housing block - a small burr in the sear housing cavity for the safety detent was causing the it to bind and leaving it stuck all the way forward, thus not putting any pressure on the notches in the safety lever itself. After a quick disassembly, filing of the burr, and lubrication, the safety detent moves like it's supposed to and the safety lever has nice and distinct on/off positions - 200% improvement.

I also checked my 40 FS (which does not have a thumb safety, but does have the frame plugs and safety-capable universal sear housing block). It did not have a similar burr, so this was probably an isolated manufacturing/assembly issue.

It may be worth checking to see that the safety detent (i.e. the silver part in the sear housing block) moves freely and springs back to put pressue on the safety lever before doing any filing of the lever.

Last edited by mkbruce; March 12th, 2013 at 04:44 PM.
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Old March 7th, 2014, 10:25 PM   #37
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Could a stiffer detent spring be used instead of filing the notch deeper?



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Old February 24th, 2017, 05:54 PM   #38
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Ive fired off a letter to S&W requesting an engineering specification for the safety lever forces both ways, from safe to fire and fire to safe. I also requested their method of measuring the forces. It has to exist, but whether they release it is another thing. Upon receiving 2 M&P's last year with uselessly weak detent's I went surfing and found this to be a common problem. If you are a 1911 man then you know how a safety should snap into place. That's what I expected with the M&P's. Several owners have filed the detent's deeper with excellent results, but a stronger compression spring could also do the trick. I don't want to get into the debate about safety's on striker fired pistols. But I find it very unusual that S&W would design in a nearly useless safety, and then ignore all the internet chatter by folks trying to improve it .
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