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Old September 16, 2012, 11:56 AM   #1
RemoWilliams
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Colt Commander front sight

My commander fires a little low, roughly 4-6 inches at 50 feet. I can compensate by changing my site picture, but I would rather put in a lower front sight.

Can the front site be replaced, and if so does it need to be done by a gunsmith?
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Old September 16, 2012, 12:11 PM   #2
Hunter Customs
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The easiest thing to do would be to remove a few thousands off the top of your existing front sight.

However before you do that be advised that pistol sights should be regulated at 25 yards.

Here's a formula for regulating pistol sights.

Figure the difference in inches between your point of aim and point of impact, multiply this number times your sight radius, take this number and divide by 900, this will give you the amount of thousands of an inch the front sight will need corrected.

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Old September 16, 2012, 12:26 PM   #3
RickB
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If it really is as much as 6" low at 50', you are going to have to remove a lot of sight to zero. Unless the sight is quite tall to begin with, you may have to remove enough that you'll see the top of the slide in the notch. I had to correct a .45 revolver that shot a foot low at 25yds, and luckily the front sight was about 3/8" tall, so I could remove a lot of it without messing-up the sight picture.
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Old September 16, 2012, 02:19 PM   #4
jglsprings
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How does the gun shoot for other shooters? What ammo are you shooting? And does the POI change if you change shooter or ammo?
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Old September 17, 2012, 12:20 AM   #5
cheezhed
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I might be wrong but on the Colt web sight I think that there is a taller rear sight that might be used to change point of aim might be worth a look.
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Old September 17, 2012, 01:03 AM   #6
michael t
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I would bench shoot it and have may be 1 other person shoot it from bench also . I neve seen a Colt Commander if sights are factory shoot that way . use 230 gr ball
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Old September 17, 2012, 08:52 AM   #7
1911Tuner
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re:

If you bought the gun used, check to see if somebody long-linked the barrel to "increase the lockup" as is often mistakenly believed is the proper way to do it.
If that's the case, it forces the rear of the barrel farther up, and the muzzle down...causing it to print low.
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Old September 17, 2012, 10:38 PM   #8
rodfac
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Hunter's right, but if you're doing your shooting at 50 ft you need to use "600" instead of "900" inches. If the gun is shooting low at 50 ft as you stated, removing metal from the top of the front sight will raise the point of impact, given the same sight picture and hold on the gun. You'll need to do considerable shooting with your favorite load, then regulate the front sight to get the impact point up where you want it.

To determine the amount that you need to lower the front sight, use the following formula...and bear in mind that all measurements are in inches. So for your 50 foot distance, you'd plug 50x12= 600 inches. Given the inter sight distance for a Colt Commander is 4.25", to get a 4" rise in impact point you'd need to file 0.028" off the front sight. For a 6" change, you'd need to file it down 0.042". In reality, it's file a little, shoot several groups, then file some more, shoot some more...til you get it right.

The formula is this for a 4" change. X/4 = 4.25/600, where x=the amount in inches for the sight reduction. Simple algebra gives you the answer of .028".

Hope this helps...I've done a lot of revolvers this way, did the math to see how much was really necessary, then went out and filed some, shot a lot, filed a bit more, then used cold blue to clean up the top of the sight. It's really easy.

Best Regards. Rod
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