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Any tips or tricks to get an "initial" center on the front and rear sights on a Sig when changing them out since both are dovetailed into the slide?

I have only ever replaced sights on Glocks. With the front sight mounted in the hole on the slide, it has been far easier for me to eyeball a center on the rear sight and then adjust as needed from there.

Any advice is greatly appreciated!
Posts: 110 | Location: Twin Cities MN | Registered: April 21, 2009Reply With QuoteReport This Post
Picture of sigfreund
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Although it sounds better than it actually works, mark the trailing edge (as they’re removed) with a pencil mark on the bottom of the dovetailed slot. Install the new sights so that their bases line up with the marks. That assumes, of course, that the bases are the same width as the originals’ are.

Alternately, mark the centers of the original sights with pencil on the slide and install the sights so their centers line up with the marks.

“Most men … can seldom accept the simplest and most obvious truth if it … would oblige them to admit the falsity of conclusions … which they have woven, thread by thread, into the fabrics of their lives.”
— Leo Tolstoy
Posts: 38772 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002Reply With QuoteReport This Post
That's just the
Flomax talking
Picture of GaryBF
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Just use your eyeballs. Then go shoot and seee where the shots hit. Shot placement is more important than the sights being centered, in my opinion.
Posts: 11279 | Location: St. Louis, Missouri | Registered: February 04, 2008Reply With QuoteReport This Post
Picture of henryaz
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I use the eyeball method to verify they haven't drifted over time. It is pretty easy to see that the margins on each side of the dovetail base are the same.
When installing for the first time, I measure the distance from the dovetail base to the end of the dovetail cutout using a 6" rule graduated in mm and .5mm. I use mostly the mm side of the rule, because it is easier for my eyes to see the graduations, and I can approximate any "in between" measurements.

all your sig are belong to us
Posts: 8425 | Location: South Congress AZ | Registered: May 27, 2006Reply With QuoteReport This Post
Picture of 10-7 leo
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Since my sight adjustment tool won't fit my P320s, I have to drift the sights. If you have access to a vice and a set of calipers, it gets you extremely close to perfect.

I taped some thin cardboard to the jaws of my vice, to keep from marring the slide's finish. Put the slide in the vice so that the sight base is slightly below the top of the jaws. Measure from the base, or blade of the sight, to the inside of the jaw. Measure the other side the same way. Drift the sight, as necessary, until centered.

When seconds count, the police are only minutes away!
If you beat your swords into plowshares, you will become farmers for those who didn't!
Political Correctness is fascism pretending to be Manners-George Carlin
Posts: 1690 | Location: Central Va. | Registered: September 03, 2008Reply With QuoteReport This Post
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I use the eyeball method. Changed front sight on my 229 last month and was actually closer to POA. Only took slightest adjustment.
Posts: 89 | Location: South Texas | Registered: February 27, 2018Reply With QuoteReport This Post
Picture of Nipper
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Eyeball. I've installed sights on about ten of my own pistols. Sigs and Glocks. Use hammer/punch method. I eyeball the install and then go to the range.

Three quarters of the time the groups were perfectly centered. The times they weren't, I took the gun home and eyeballed the adjustment needed. Every time the correction was perfect. Obviously, if you used a sight tool, this could be done at the range.

I'm not sure if it is possible to actually measure the center of the sight and the center of the slide and then produce a centered group. Not only manufacturing tolerances, but some guns and shooters just shoot a little differently. All that matters is centered hits for you with your own individual pistol.

An expert is one who knows more and more about less and less until he knows absolutely everything about nothing. --Nicholas Murray Butler
Posts: 4094 | Location: Northeast | Registered: June 29, 2006Reply With QuoteReport This Post
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