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OK, I've seen this posted several times about sights needing to be removed right to left and I don't understand why. It seems to be the consensus that they only move in one direction. I'm not a gunsmith but I do have extensive woodworking experience and some machining and metal fabrication experience. The dovetails for sights are cut with a milling bit which makes parallel cuts. If the dovetail was angled then the sights would only go so far into the slide. They would either be loose and then stop at the point where the two mating pieces match. This being the case you could never adjust for drift past the point of contact.
I have just measured with a vernier caliper the width of both sides of the socket for the rear sight on my XD Sub and they are identical. The depth of both sides is also identical. I know for a fact that the front sight will slide on and off from both sides as mine was loose with I got the XD Sub. If the bottom surface was stairstepped, then the depth of each side would be different.
The tolerances with parallel surfaces can be tight enough to make the two mating surfaces very tight and difficult to move. If I'm missing something, please educate me.
EDITED - In other words, it seems as though you should be able to remove the sights either right to left OR left to right.
I have just measured with a vernier caliper the width of both sides of the socket for the rear sight on my XD Sub and they are identical. The depth of both sides is also identical. I know for a fact that the front sight will slide on and off from both sides as mine was loose with I got the XD Sub. If the bottom surface was stairstepped, then the depth of each side would be different.
The tolerances with parallel surfaces can be tight enough to make the two mating surfaces very tight and difficult to move. If I'm missing something, please educate me.
EDITED - In other words, it seems as though you should be able to remove the sights either right to left OR left to right.