Rear Sight Loose - MP-Pistol Forum

Rear Sight Loose

This is a discussion on Rear Sight Loose within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; On my M&P 9 FS, when I loosen the set screw, the rear sight is really loose and almost fell out. Is this normal?...


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Old July 26th, 2015, 01:28 PM   #1
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Rear Sight Loose

On my M&P 9 FS, when I loosen the set screw, the rear sight is really loose and almost fell out. Is this normal?
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Old July 26th, 2015, 01:34 PM   #2
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That's looser than any I've seen.
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Old July 27th, 2015, 08:44 AM   #3
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If it's ok when the set screw was tight, then you should be one happy guy!!
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Old July 27th, 2015, 04:46 PM   #4
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No problems with the set screw holding it. But, is kind of odd that the sight almost slid off when the set screw was loosened.
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Old July 27th, 2015, 04:59 PM   #5
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The key word here is "almost" but, obviously it didn't , .....tighten your set screw and go enjoy your gun.

Last edited by Turbo38GN; July 28th, 2015 at 01:07 PM.
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Old July 28th, 2015, 07:45 AM   #6
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Not really normal. I'd add some loktite (blue) if mine were like that


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Old July 28th, 2015, 07:53 AM   #7
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Not really normal. I'd add some loktite (blue) if mine were like that


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This ^^^, with the LocTite on the bottom of the dovetail cut in the slide (between slide and rear sight).
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Old July 28th, 2015, 08:08 AM   #8
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It shouldn't be that loose. Even with the set screw out it should still require a hammer and punch to drive it out. If you are able to remove it by hand I would call S&W and get them to take care of it. I personally wouldn't rely on a dainty set screw to hold in my sights.
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Old July 28th, 2015, 06:01 PM   #9
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Originally Posted by kdweaver View Post
It shouldn't be that loose. Even with the set screw out it should still require a hammer and punch to drive it out. If you are able to remove it by hand I would call S&W and get them to take care of it. I personally wouldn't rely on a dainty set screw to hold in my sights.

Hence the Loctite recommendations.

One can also raise material in the bottom of the slide dovetail cut with a punch and hammer, or flatten the front and rear edges of the rear sight dovetail a bit to make it thicker, and bind better with the dovetail cut in the slide.

The Loctite solution is just quicker, and easier for those without much hand tool or 'smithing experience.

Last edited by Rick M; July 28th, 2015 at 06:04 PM.
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Old July 30th, 2015, 04:29 AM   #10
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Thanks for the replies guys. I'll try the blue loctite for now. I ordered a new rear sight for it yesterday. Hopefully it will fit tighter in the dovetail.
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Old July 31st, 2015, 02:11 PM   #11
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Be careful with the Loc-tite. Don't let it get into the striker block parts. Since the sight comes out left to right and goes in right to left, I used a dab just to the left of the striker block and then drove the sight in.
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Old July 31st, 2015, 02:50 PM   #12
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Don't get any Locktite on any plastic parts, it can literally destroy some plastics.

Since some plastics are safe, and some are definitely not safe, since I and likely you also, don't know which can be negatively effected, best policy is to avoid use on plastics.
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Old July 31st, 2015, 03:28 PM   #13
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Originally Posted by agksimon View Post
Be careful with the Loc-tite. Don't let it get into the striker block parts. Since the sight comes out left to right and goes in right to left, I used a dab just to the left of the striker block and then drove the sight in.
^^^^This is extremely important!
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Old August 1st, 2015, 05:57 AM   #14
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All this, make the vote 4.......

Definitely the blue, oddly enough I have been experimenting with some machine screws/nuts this past week. Holds very tight BUT can be loosened with just a screwdriver and pliers holding the square nut. And at this point, you can unscrew it and rescrew it without adding more. Of course this is all unscientific.

Quote:
Originally Posted by agksimon View Post
Be careful with the Loc-tite. Don't let it get into the striker block parts. Since the sight comes out left to right and goes in right to left, I used a dab just to the left of the striker block and then drove the sight in.
Quote:
Originally Posted by G56 View Post
Don't get any Locktite on any plastic parts, it can literally destroy some plastics.

Since some plastics are safe, and some are definitely not safe, since I and likely you also, don't know which can be negatively effected, best policy is to avoid use on plastics.
Quote:
Originally Posted by Rick M View Post
^^^^This is extremely important!
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Old December 5th, 2015, 12:34 AM   #15
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Quote:
Originally Posted by kdweaver View Post
It shouldn't be that loose. Even with the set screw out it should still require a hammer and punch to drive it out. If you are able to remove it by hand I would call S&W and get them to take care of it. I personally wouldn't rely on a dainty set screw to hold in my sights.
I won't sending anything back to S&W. I'm in Canada and the last time I sent a gun back to them it took over 2.5 years before I got it back. I replaced the rear sight with a new one and it's a bit better. It goes on but does not slide on like the original one. This one I have to tap in using a piece of plastic dowel. But, only with the slightest tap. It's still loose but won't fall out like the original one.
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