Loose rear sight on my M&P 9c

[2tango2]

I have noticed that the rear sight on my 9c was sliding ever so slightly to the left after a range session. I was surprised that I was able to loosen it up with a screwdriver and adjust it back

My question is should the sight be able to be moved so freely? I could easily take the sight right off the back of the slide if I wanted too. I was under the impression that it should be in there so tight that a sight pusher would be needed

Is there an issue with the slide or sight? Should I just apply a dab of loctite and call it a day?

Thinking of TFOs but don't want to get if it turns out the slide is milled incorrectly at the rear sight channel

Thoughts?

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[Neumann]

Set screws will not hold a loosely fitted sight for long. It's not clear from your post if there is a set screw, or you simply used a screwdriver as a tool to move the sight. (Next time, use a brass drift punch or sight pusher.)

You can tighten a dovetailed sight by peening the bottom with a center punch, which raises metal a few thousandths around the dimple. You can also apply Lock-Tite designed to fill gaps for bushings and such. It is often green or purple, and labeled for this application.

 

[Mushki]

Without being able to measure the gun I cannot tell you which component is to blame. You can lock it in place with the screw and a dab of nail polish. If your lucky it will be the sight to blame and the new truglos will solve the problem for good.

 

[2tango2]

I used a hex (star?) screwdriver to loosen the screw...when the screw is loosened I can push the sight out with my finger if I wanted too. No brass punch or sight pusher needed.

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[curlysir]

Something is wrong with either your sights or slide. You should not be able to move the sights without a sight pusher or hammer and brass punch. Hopefully it is the sights and not the slide. I would try and find a dealer/gunsmith or someone that stocks sights and take the gun or slide to them and see if different sights do the same. If they do you have a slide problem.

Do you know anyone that might have changed out their stock sights? If so you could try them and see where the problem is.

 

[dullh]

I have replaced the factory sights on all my M&P's...on two of them, the factory rear sights were so loose that after removing the screw, simple thumb pressure was all I needed to push them off the slide! Replacement sights have gone on tight in every case...

 

[2tango2]

Thanks for the info guys, hopefully replacement sights will fit nice and tight. Sounds like what dullh described is dead on with what I'm seeing


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[RalphMP9FS]

My factory new MP9FS came with red loctite on the rear sight set screw.

 

[2tango2]

My factory new MP9FS came with red loctite on the rear sight set screw.

I could see red loctite on the screw that I undid on the sight. Didn't hold too well I guess lol


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[Mushki]

If you pm me your address I can send you a sight set I took off my m&p compact with a sight pusher, aka undamaged or a sight set I removed from my pro series that took off pre sight pusher, aka dinged up.