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Below is a picture of my last homemade sight for my M1917, at least for a while. It is the ultimate in simplicity. An aluminum plate is fastened down using the existing threaded hole for the rear sight spring and a 6-40 machine screw. I bought an aperture base for a Williams 5D receiver sight off Ebay. So, I can adjust for windage using the Williams aperture base. I can raise the sight either by putting shims under the Williams aperture base or by raising the aluminum plate using the three set screws.
Initial trip to the range indicates I need to move the aperture .040" right. A .032" shim will put me right on for my favorite cast boolit loads.
If anyone wants to make their own sight based on my ideas, let me know and I'll post part drawings.
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The M1917 front sight is adjustable, but staked heavily. I have a device that the Belgians made up after WWII for M1917 rifles, to allow the front sight to be pressed left & right.
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A front sight adjustment tool would make the job easier. But I just clamp the muzzle in a vise with leather padding. Then I drive the sight L or R with an aluminum rod and a big mallet. I measure after every few whacks to see if it's gone far enough.
One reason I really like the rear sights to have windage adjustment is I can't stand to see the front sight off-center, especially if there are protective ears for reference. But I can stand the rear sight being a few thou L or R. Just my brand of OCD I suppose!