I got some trijicon night sights installed on my glock 43 and after shooting maybe around 400 rnds through it I noticed that the rear sights have moved. do I need to put Loctite on it in order for it to stop moving?

I got some trijicon night sights installed on my glock 43 and after shooting maybe around 400 rnds through it I noticed that the rear sights have moved. do I need to put Loctite on it in order for it to stop moving?

That sucks!  All of my Glock sights need sight pusher to move.  One even needed some filing to fit (on purpose to ensure it doesn't slide unnecessarily due to tolerances). 

On Loctite, be careful as it can lead to the sight being pretty hard to remove.  On my PPQ, I filed the rear sight too much and it slide almost freely.  It has a set screw, but I was still concerned about it moving, so I decided to apply some blue Loctite (the "non permanent" one).  Anyways, I decided to replace the rear sight with a new one and when I went to remove the old one, it was a SUPER PITA to remove!  I only applied very little in the rear of the sight channel and a dot in the hole for the set screw.  I thought it would be easy to break the bond and then the sight would come right out, but it had be swearing for a while as I trying to remove the sight by hammer and dowel method.   

The correct method would be to peen the sight.  Not terribly difficult.

The correct method would be to peen the sight.  Not terribly difficult.

I knew I should've asked around. . .

So I assume you would peen, or flatten out the rear tab or base of the sight?  So to make the material wider? 

The 10-8 steel was super hard and it would take a bunch of filing to remove just a little.  I guess the steel Dawson sights use are much softer.  I was doing the file, check width, repeat method and I got impatient and the sight would slide through almost freely.  I still have the sight that I filed too much and I could give this a try as a test. 

Does the sight have set screws? I'm assuming not because none were mentioned.

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drck, next time you run into a situation where you are unable to loosen the set screw because of your use of loctite, use the tip of a soldering iron to heat the set screw and soften the loctite. A minute should do the trick.

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drck, next time you run into a situation where you are unable to loosen the set screw because of your use of loctite, use the tip of a soldering iron to heat the set screw and soften the loctite. A minute should do the trick.

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The set screw came out no problem. Seems like the Loctite set up pretty good in the channel in the slide and wedged it in pretty solidly.

Does the sight have set screws? I'm assuming not because none were mentioned.

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no the rear sights doesn't have any set screws.

The set screw came out no problem. Seems like the Loctite set up pretty good in the channel in the slide and wedged it in pretty solidly.

Loctite is not incorrect to use on sights and I use different types of red in addition to blue.  Now I am not an engineer, maybe you know one,  but it is my understanding that the Loctite holds tighter on threads with rotational forces as opposed to sheer forces like a dovetail.  I do find that in my experiences threads hold tighter than slip or shear.  But again there are different Loctites for different applications such as this.

"Peening" is traditionally done on the bottom flat of the sight, but I have done it on the edge of the sights dovetail.  Displacing metal to form a mechanical lock, similar concept as staking or swaging.  DO NOT alter the slide dovetail.

Loctite is not incorrect to use on sights and I use different types of red in addition to blue.  Now I am not an engineer, maybe you know one,  but it is my understanding that the Loctite holds tighter on threads with rotational forces as opposed to sheer forces like a dovetail.  I do find that in my experiences threads hold tighter than slip or shear.  But again there are different Loctites for different applications such as this.

"Peening" is traditionally done on the bottom flat of the sight, but I have done it on the edge of the sights dovetail.  Displacing metal to form a mechanical lock, similar concept as staking or swaging.  DO NOT alter the slide dovetail.

Dawson recommends the red on their sights, but I haven't tried.  In a set of 10-8 sights that I installed previously, the directions recommended using blue Loctite to ensure that the front sight fitted perfectly in the hole in the Glock slide, so I assumed that the blue soft did a good job of filling any gaps.  It worked well in that application, so I figured that I would apply that when I filed the Dawson sights too much.  I applied some in the slide dovetail and all I know is that it set up REALLY well!  I was swearing at the thing as I was tapping the sights to get it back out.    In terms of "engineering", I totally didn't expect that the blue would wedge the sight in like that!   

Yup, I use the blue for the set screw as well on other sights.  And all of those thread locking applications broke free with a just a moderate amount of force.  Maybe I should have heated the thing a little bit when I noticed that it was wedged in there.

Hmm.  I'll have to try that peening.  I do have a set of Trijicon sights were the rear is slightly looser than I would like.