Front sight is too short...

[KBintheSLC]

I am buying a replacement front sight for my Glock 20. It currently has Trijicon night sights on it and the front sight is only 0.150" tall. Being this short, it makes POI about 4-5" high at 15 yards. I want to lower the POI by installing a taller front sight. So far, I have found one that is 0.170" and another at 0.215". I am not sure if the .170 will be enough, and I wonder if the .215 will be too tall. What do you guys think?

Thanks

 

[gb6491]

Give Dawson Precision a shout, they can tell you what height you'll need:
http://www.dawsonprecision.com/Cate...nt+Sights:Glock+Tritium+Inserted+Front+Sights
Here's a relevant post from another forum: http://kahrtalk.com/17069-post12.html

...or you can try this: http://www.jackweigand.com/Point Of Impact Adjustment Formula.html
Edit: I just punched the numbers for a 5" change at 15 yds. (6.77x5/540=.063 + .150= .213); a 4" change comes out at .200

Regards,
Greg

 

[W.E.G.]

Do the math.

Step 1
Measure sight radius.

Step 2
Measure the firing distance in inches.

Step 3
To calculate the amount of movement needed to move the point of impact one inch, divide the sight radius by the firing distance.

For instance, if your sight radius is 5 inches, changing the sight height by 0.009" will change your point of impact one inch at 15 yards.

 

[oldrevolverguy]

I had the same problem on several of my Glocks

I replaced them with Ameriglo night sights and have been very pleased. They have a calculator on line that has worked perfectly in my experience. Here is a link:

http://www.ameriglo.net/sights/calculator

Good luck.

 

[KBintheSLC]

Thanks for the help guys. This is why I love THR. I think that a 0.200" ought to do the trick, and AmeriGlo has them for $42.