Quick 1903A3 zero question...


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DMK
May 16, 2006, 06:58 PM
My 03A3's rear sight has 200 yards as it's lowest setting but my local range only goes out to 100. I figure a 200 yard zero with M2 ball should be 2"-2'5" high at 100. Does that sound right?

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nbkky71
May 16, 2006, 07:59 PM
That's pretty close.

Vern Humphrey
May 16, 2006, 08:42 PM
An 03A3 that hasn't been rebuilt is pretty rare. In re-build, they didn't pay much attention to keeping the zero on the index -- as long as the rifle could be zeroed, that was fine.

The first thing to do is shoot the rifle. If it shoots as you expect, that should be good enough. If you need to adjust it, there are two ways I like -- first of all, you can easily make (if you cannot find) a new front sight that is lower or higher than the one you currently have.

Second, if it shoots high, I like to put a blob of epoxy on the sight, color it with typewriter correction fluid, and make a good, easy to see hunting bead.

cracked butt
May 16, 2006, 08:43 PM
It will be close enough. Have you shot it at 100 yet? Some of the rifles, including mine shoot very high at 100 yards and I needed to fabricate a taller front sight to make it shootable.

DMK
May 16, 2006, 08:49 PM
Yea, I shot it when I got it from CMP last fall. It shot high so I fabbed up a taller front sight. The plan now is to go to the range this weekend and file it down to a 200 yard zero.

Thanks for the replies. :)

cracked butt
May 16, 2006, 09:04 PM
If you want a quick and dirty way of determining the extra height needed on the front sight, measure the distance between windage witness marks for the rear sight- the distance between each line equals 4 MOA. Better yet, measure across the entire windage scale and divide by the number of marks (minus 1 mark as you wouldn't count the first mark). Use this ratio to give you the amount of correction per amount of extra height. FWIW, mine shot 10" high and I ended up fabricating a front site approximately 0.080" taller IIRC- it was dead on.

DamnedDirtyApe
May 16, 2006, 11:10 PM
How did you guys fab a new front sight?

Mine shoots about 12" high.

Sorry to hijack.

cracked butt
May 16, 2006, 11:42 PM
Go to your local lowes, home depot or other builder supply/hardware store and find a bracket called a 'joist hanger' it should be exactly 0.050" thick, the same thickness as the front sight. Take your dial calipers along just to make sure. Remove your front sight, using it as a template, scribe the pattern on the bracker and cut it out with a hacksaw/file or dremmel tool, leaving a little extra on top- you'll have to creatively shape it a little to make it look like the original. Drill a hole where the pin goes through it. Degrease the new sight carefully and blue it, you can just spray it with sight blackener instead if you want to.

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