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Discussion Starter #1
I want to change both my Tactical and Service sights for centermass POA. I plan on having Dawson adj installed on my Tactical but I want to keep fixed sights on my Service. Anyone know of a link that explains what the numbers on Sig sights mean as far as height goes?

Anyone got a link on where to buy Sig sights?

Thanks
 

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Hello mpholic.
the sig sight are numbered from 5 thru 9 on the front and 5 thru 10 on the
rear.
to elevation change up/down.
sight # 8 is standard for both .
each number is set for 25 yards.
front sight numbers equal 1" change at 25 yds.
a front #9 will move impact up 1" from a #8, and a # 7 will move impact
down 1" from a #8.

rear sights are equal to 2" change at 25 yds.
a #9 will move impact up 2" from a #8, and a #7 will move impact down
2" from a #8.

so on both front and rear sight a up(larger)number will move impact up,
and a down(smaller)number will move impact down.

windage adjustment : a left or right movement of the sight of .020"
will change the poi aprox. 3" at 25 yards.

hope this helps.
rick
 

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Discussion Starter #3
You said #8 is standard. Is that for Sig only or does that apply to XDs also?

I did find a chart that listed the heights for each number in inches. Is this measuremnt taken from the top of the sight blade to the top of the doevetail base OR from the top of the blade to the bottom of the base?

Thanks alot.
 

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the standard #8 is for sig guns,I have not measured a standard xd sight
or compaired one to a sig.
here is a formula to compute the amount of change in hight you need to make.
Sr= sight radius in inches (5.75 for 5 3/4")
error in inches(how far off the poi is from poa.
D= distance to target in inches(25yards would be input as 900")

Sr x error
________ = amount to add or sub from sight
D


example: (Sr)4.00" x 6.00"(error in poi ) = 24
________________________ ___ = .0267"
(D) 900" 900"


If you are shooting low by 2" you could go up one number on the rear or
2 numbers on the front with sig sights.
f.y. i rick
 

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Life is full of new knowledge.
 

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I recently put Sig 8/8 Truglo's on my XD40. The factory XD sights gave me that 6 o'clock aim thing, which I dislike. The #8 Sig sights moved it substantially. Now the point of impact is essentially the same as point of aim with the front dot covering the point of impact.

Differences in your gun and ammo can make a slight difference, but I found that the #8 gave me the combat style aiming that I prefer.
 
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