Glock 21 replacement sights
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  1. #1
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    I'm new here and new to Glock and I just bought my neighbors Glock 21 .45. I think it might be a gen 2. Doesn't have any rails or anything. Anyway got a couple questions. Are the sights replaceable? When I take it apart and look under the front sight there is no screw or anything to remove the sight. The rear sight is the same. Looks like it's part of the slide. 2nd question I seen some kind of laser that mounts on the rear sight? Is that a thing and if so anyone know where I could get one? Thank you. Hopefully this is in the right spot.
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    Last edited by Vplw1226; 07-27-2020 at 09:02 PM. Reason: Adding a picture

  2. #2
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    The rear sight is a dovetail mount which slides in/out via the side cuts and the front sight is a "pinned on" which can be reused with careful disassembly, but most all replacements are going to be a "screw" mount type.


    I do not understand the question about the laser part.

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  3. #3
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    I've seen red dots mounted in the dove tail rear sight but not lasers.

    Gaz
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  5. #4
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    Just from the brief description, I’d say you have an early Gen-2 21.

  6. #5
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    The front sight is an old Glock staked sight. You can use a small pin punch and push the center pin out and remove the sight or as most people do, just grab them with pliers and twist until the sight breaks off.

    Current Glock and aftermarket sights use a screw for the front sight and they will fit the hole in the slide.

    The rear sights, like Ot said, press out and new sights press back in.

    When purchasing replacement sights, be sure to get ones intended for the large frame Glocks - you’ll want them to specify your 21.

    There is a mount for a red dot sight that replaces the rear sight.


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  7. #6
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    I have the same question. Mine comes with the same little triangle for the Front Sight, and an adjustable Rear Sight which for some reason we cannot "zero in" no matter how we adjust it. I am contemplating on replacing it with those fiber optic sights.

    Question #1: what is a good brand for replacement sights?

    Question #2: How do you "zero" those replacement sights if they are "fixed" / not adjustable like the factory ones?

    Thanks guys and sorry for hi-jacking this thread.

  8. #7
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    I don’t know if they ship internationally but Dawson Precision is hands down the best in my opinion. I prefer black rear (no fiber) with fiber front sight. https://dawsonprecision.com/dawson-p...ion-sight-set/

    When installing the sights they only need to be centered left to right on the slide to be “zeroed”.

    If the sights are the correct height for the gun they will be accurate point of aim/point of impact (poa/poi) out to at least 25yds. There can be some variation with different ammo but seldom is it enough to matter.

    As my eyes have aged, I find wider notches in the rear sight to make a big difference but if you’re not old enough for reading glasses, you don’t need to worry about that. Just go with the default size.


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  9. #8
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    There is a seller here in the Philippines for the Dawson Precision. Will look into that. Have you tried others like Ameriglo and Truglo? I was also wondering, since my glock is ported, will a fiber optic front sight work with that?

  10. #9
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    Frank sports Truglow fiber optics as well as Lasermax guide-rod red laser module.


    (Yes I did the change-out/install myself)










    Last edited by Otintx; 09-09-2020 at 07:56 AM.

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    Lone Watie: I notice when you get to DISlikin' someone they ain't around for long neither.

  11. #10
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    I also use Truglo fiber optic with tritium but as I age I have just added a Burris Fastfire III to my steel match pistol and will see how that goes this weekend.

    I can't see why fiber optic sights wouldn't work with a ported pistol.

    Also you adjust non-adjustable sights by changing the front sight with a taller or shorter one. The front sight is usually replaced first because it's easier to do but the rear sight can replaced also with different heights.

    Gaz
    Last edited by OHgaz; 09-09-2020 at 11:02 AM.
    "The Constitution shall never be construed to prevent the people of the United States who are peaceable citizens from keeping their own arms." - Samuel Adams, Massachusetts Ratifying Convention, 1788

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