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PostPosted: Mon Sep 03, 2018 7:42 pm 
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Joined: Mon Sep 03, 2018 1:05 pm
Posts: 3
Hello

I recently bought a umarex m'n'p 40 and the rear sight is loose.

any one else have this problem? I am looking for a solution


Last edited by Cloakedraven82 on Mon Sep 03, 2018 9:15 pm, edited 1 time in total.

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PostPosted: Mon Sep 03, 2018 8:08 pm 
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Joined: Mon Jan 01, 2007 10:54 pm
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Location: Saint John NB
Loose as in the screw? Or the dovetail base? Either way, a little lock tite should help

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PostPosted: Mon Sep 03, 2018 8:22 pm 
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The base is loose..

is the rear sight held by the screw inside the Rail??


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PostPosted: Mon Sep 03, 2018 9:05 pm 
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Joined: Fri Oct 18, 2013 7:37 pm
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Location: Montreal area
No screw inside to hold the rear sight (under the blowback chamber), just finished re-assembling mine for another problem.

Field strip the gun, all the way back inside to the slide there is a screw that hold the blowback chamber undo it and slowly pull the chamber, be carefull on the left (I think) there is a spring and a plunger, go slow you'l see it, but I did not see any screw that holding the rear sight...

SilentMan...

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PostPosted: Mon Sep 03, 2018 9:08 pm 
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Location: Montreal
Careful because if you lose it, the gun is done. They don't sell the sights or even complete slides.
I lost the front post on my 1911 and was saved by a seller who had a junked one and who sold me his slide.

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PostPosted: Mon Sep 03, 2018 9:14 pm 
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Joined: Mon Sep 03, 2018 1:05 pm
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silentman wrote:
No screw inside to hold the rear sight (under the blowback chamber), just finished re-assembling mine for another problem.

Field strip the gun, all the way back inside to the slide there is a screw that hold the blowback chamber undo it and slowly pull the chamber, be carefull on the left (I think) there is a spring and a plunger, go slow you'l see it, but I did not see any screw that holding the rear sight...

SilentMan...



you lost me.. what you explained is for the blow back chamber??

I am trying to find out about removing the rear sight because it is loose and need to make it not loose.


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PostPosted: Mon Sep 03, 2018 11:14 pm 
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Joined: Wed Feb 04, 2015 7:23 pm
Posts: 137
Location: Canadian Prairies
The rear site can not be removed without pulling out the blowback chamber. A tricky procedure to disassemble and reassemble, as SilentMan mentioned.

The screw inside the back of the slide fits up into a recess in the rear sight, but the 'dovetail' of the sight is also not a complete dovetail, it is cut out around the blowback chamber and the sight binds on the blowback chamber, so the sight will not slide out even with the screw removed. It will only slide out if the blowback chamber is removed.

The sight can be held in place without removing the blowback chamber (or even without removing the slide, just lock it open to access the screw).
The screw is listed as an M3x6mm. If you can find a longer M3, maybe an 8mm, it can be used instead and can put upward pressure on the rear sight to hold it in place. This may also raise the rear sight and help with a low Point of Impact problem. Just experiment with the length in order to make sure the length is correct to allow the screw to be fully seated inside the slide while pressuring up on the sight.

All the best!


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