03-A3 rear sight aperture

Thread starter #1
I have a 1903-A3 Springfield rifle, made by Remington with a two-groove barrel, and it's been sporteruzed. The barrel is cut to 18 1/2 inches the stock has been shortened and recon toured with the top wood removed, and the bolt has been chromed.

PROBLEM: The rear sight's aperture slides under the rifles recoil. Because this rifle has been sporterized and the barrel bobbed, it is lighter than a standard World War II issue rifle.

That little metal tab that goes over the sliding peep sight directly in front of the aperture, which is held down by a single tiny screw and presses the sides of that little flat spring steel tab against the left and right sides of the rear sight assembly, just doesn't generate enough friction to hold it in place.

If that little flat metal tab had a tooth built into it of substantial size, then the tooth could engage the notches milled into the left side of the rear side assembly but my little tab is basically flat. There's a line or crease put in it, but it doesn't even feel like a projection .
If it protrudes out at all, it's probably only one or two thousandths of an inch. C3C6D1A1-958F-4BA6-9010-3A085CF0885A.jpeg
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Senior Member
You ain't got a hammer and chisel? Actually I would use a piece of aluminum stock instead of a chisel. Reform the detent on the spring. Or, could you use a longer screw and have it extend down and bear against the slanted base under the aperture ? Basically you would be locking the aperture in one spot.


Senior Member
If you decide to reform your detent I would recommend a piece of hard dense wood as the anvil under the spring when you tap tap it with your small tap tap gunsmith's hammer.