Back to the slide stop (SS) issue.
The arrow in your photo shows the aft end of the SS contacts the magazine tube. In order to do that, that portion of the tube must be forward of the dog house shaped frame cutout for the SS. None of my magazines will go far enough forward for that tube surface to protrude into that hole. Army Ordnance specs show the distance from the forward surface of the SS pin hole in the frame back to the aft surface of the dog house hole (slanted forward at 4° from the vertical) should be between 1.3085" and 1.3175". My wadcutter gun measures 1.311" using the ID nibs of vernier calipers.
Strip the frame down far enough to push the SS plunger back into its hole and use the ID nibs of your calipers to measure from the forward part of the SS pin hole to the aft surface of the dog house hole. Your calipers should be 4° from "horizontal" if your dog hose hole has the 4° slant.
Q1: What did it measure?
[both of those measurements given for the overall length of the SS arms are within spec, but don't mean much. Distances from the SS pin are the important ones.]
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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