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Old 11-19-2018, 09:32 PM
falconjfs falconjfs is offline
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Default Big Dot Rear Sight Problem with Shield

I decided to change out the factory rear sight on my Shield 9MM. I had a gunsmith install a DXW BIG DOT sight. I have used the small allen wrench to tighten the rear sight lock screw. The problem is, after I shoot maybe two magazines, the sight becomes loose again, and can be moved. So I tighten it again and again and the same thing happens. It come loose! Any solutions other than take it back to another gunsmith?
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Old 11-19-2018, 09:38 PM
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Threadlocker blue.
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Old 11-19-2018, 11:07 PM
falconjfs falconjfs is offline
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Thanks..appreciate it!!
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Old 11-20-2018, 02:06 AM
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Do not insert wet screw into hole. Ever.

Remove screw.
Clean with rubbing alcohol and a toothbrush. Let dry.
Add one small drop of blue thread locker to the middle of the threads. Turn the screw to spread the locker evenly.
Set the screw down. Walk away.
Come back 15 minutes later. Insert, tighten without over tightening. About 12 INCH pounds of torque.

You done.
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Old 11-20-2018, 09:21 AM
Real Old Navy Real Old Navy is offline
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Gunsmith huh? I'm surprised he didn't know about putting Threadlocker on it. You can get it at any Auto Parts store. Made by Loctite. Be advised once you use it, if you need to remove the screw, you will need to apply heat first to loosen it...or you may strip out the allen screw head...and use the Blue Threadlocker...not the Red.

Last edited by Real Old Navy; 11-20-2018 at 09:24 AM.
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Old 11-20-2018, 09:33 AM
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BTW, if the sight is centered in the dove tail and is so loose it requires the set screw to actually anchor it, the sight was either undersized from the factory, or your gunsmith ruined it by removing too much material before installing it.

The sight base and dove tail are critically machined to make for a very tight fit with a slight right to left taper. If the fit is too tight with a replacement sight, which is usually the case, the installer gradually sands the bottom (only) of the sight until it can slide in from the right about 1/2 way with finger pressure. The rest of the way to get it centered takes some force. The screw is meant only as a backup, not the primary method of holding the sight in place.
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Old 11-20-2018, 08:32 PM
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I was surprised also, when I took the gun to the range, and realized that the sight would not stay tightened after no more than 10-12 shots. I kind of felt that the gunsmith should have sighted the gun in, and locked the sight in place. I'm new at this stuff, so I had to rely on my sense of logic in thinking what the gunsmith should have done as opposed to what he did. But thanks to those of you that responded, I'm wiser today than I was yesterday.
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