40 cal glock

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With and acetylene torch, sledge hammer and lots of anger......

You could put the slide in padded vise and secure it. The sight will drift with a pin punch and small hammer. If you are really careful using this method you will probably only mar the sight a little bit. If you make any mistakes you might leave some scratches and make the whole thing look "messy".

The best method is to use a sight pusher specifically for the Glock. You can find them pretty easy. They aren't exactly cheap so another option is to find someone who has one you can borrow or pay a professional a few bucks to do it for you.
 
or you can buy an adjustable rear sight and have it installed by a gunsmith.

next question is: why do you want to adjust it? i've never seen a glock that was off in windage from the factory.
 
I bought a Millett adjustable rear sight since the Glock had fixed rear sights. Works great. Didn't want to fool with the Glock sights.
 
An unsharpened pencil with the eraser and metal cut off should work as a punch that won't mar the sight. Tap it lightly and slide it in the dovetail.

A nylon tipped punch is the best way short of a sight pusher but not many people have either on hand.

If you do make marks on the rear sight you can pick up another one for a couple bucks, not a lot of risk in doing this job yourself.
 
How about a piece of wooden dowl, the right diameter. That should work without marring the sights of slide. Just a thought.
 
The factory plastic rear sight is easy to adjust with a punch or dowel. However, if the sight's centered on the slide and you're shooting low and left (if you're right-handed), then it's shooter error.
 
The factory plastic rear sight is easy to adjust with a punch or dowel. However, if the sight's centered on the slide and you're shooting low and left (if you're right-handed), then it's shooter error.

I disagree. I have seen some slides manufactured poorly and sights ended up nearly all the way to one side for shots to hit centered. Glock replaced three with no questions and the other guy didn't mind that his sight was all the way over.

I have also seen a couple shooters who needed a little drift to one side or the other. Something about their eye/grip/trigger manipulation causes it. Two of them were VERY good shooters, shooters whose other guns shot to POA with the sight centered but for some reason the Glock did not. Rather than adapt to a gun they adapted the gun to them, for an advanced shooter this is a reasonable approach.
 
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