Privacy guaranteed - Your email is not shared with anyone.

Adjusting Rear Sight

Discussion in 'General Glocking' started by jmsfmtex, Nov 25, 2012.

  1. I would like to adjust my rear sights. I have the tool but would like to know what is a good distance, from the target, so sight in? Would different calibers make for different distances? I am not looking at long distances with maybe the longest being 25yds. Any comments are welcome.
  2. JBnTX

    JBnTX Bible Thumper

    Aug 28, 2008
    Fort Worth Texas

  3. wilhelm51


    May 23, 2012
    Charlotte, NC
  4. Thank you guys for the quick response. Advice taken.
  5. dhgeyer


    Jul 15, 2011
    If you want to figure out how far to move the rear sight, you do this:

    Divide the distance in inches that the center of your group is off center by the distance in inches you are shooting at. Say you're off 3" at 25 yards. There are 900 inches in 25 yards. So, 3 / 900 = .00333. Now, multiply that by the sight radius of the firearm. On my Glock 19 that's 5.75", with aftermarket sights. So, .00333 x 5.75 = .01915". That's how far you need to move your sight.

    Of course sight moving tools, or in my case mallets and job-made punches, don't have vernier scales on them. So this information can't normally be applied directly to the sight. What I do is set my caliper to the result I get and just eyeball the gap to get a good idea of how far to move the sight. I also mark the starting point on both sides with a very sharp pencil so I have some idea of how far I've moved the sight. By comparing the distance between the side of the sight and the pencil mark on the slide to the gap in my caliper, I can get pretty darn good results.
  6. You can print yourself some zeroing targets out. Link:

    The proper scale target fits on standard A4 pages. It also says on the target how to adjust (how many clicks and direction) your sights when you hit certain areas of the target. There is also a very good explanation on the target on how to use it. It's pretty simple.

    EDIT: Sorry, I thought I am on the Black Rifle forum. Those targets are meant for rifles.
    Last edited: Nov 25, 2012
  7. AK47Man

    AK47Man Expert Marksman

    Feb 7, 2007
    Do you have rear adjustable sights or are you going to "drift" the factory
    OEM ones? I would buy and install a set of Glock OEM adjustable sights..If you dont already have them....
  8. LampShadeActual


    Sep 12, 2012
    25 yards.

    With the plastic sights or fixed steel, you will be lucky to get a predictable 3" minimum move. That usually works out fine. The plastic sights load up and then move about that much each jump.

    Get a 0.5mm pencil, mechanical, and put a narrow line on each side of your rear sight AFTER you dry the slide dovetail of oil. Move the sight just enough to cover the line on one side. That will be about 3" at 25 yards. If you over travel, the back side will show the gap you made with the other line.

    If you have a Glock sight tool, align the receiver with the sun so the pencil line is brite grey. You can see it move with small rotations of the adjusting screws handle.

    With Glock Steel sights, roughly the same.

    With Trijicon Steel night sights, don't use a newer Glock tool. The Trijicons don't move and you will destory the post Katrina design. You have to use one of the older heavy duty units for those.
  9. WOW Thanks for all your valuable information. I am using the UNI-200L Universal sight tool for drifting the sights. I have, mostly, TruGlo with one Trijicon. I will be taking all the advice to the range with me. Thanks again. Best regards and wishing everyone an early Merry Christmas.
  10. Tazz10m

    Tazz10m Mod Aerator Moderator Millennium Member