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Barrel keeps coming loose

MossMonkey

Copper BB
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Hand me down 70's era 500at.
When I got it the ejector was worn, so clearly it has some mileage on it. The takedown screw and mag tube come loose after a few shots.
Is the bb detent ball supposed to sit in the indentations on the barrel lug? Because it seems like it should but it doesn't. So I have no idea what the bb and a lil spring pressure is supposed to do.
Maybe the takedown screw is aftermarket/wrong?
Is that gap between the barrel lug and mag tube normal?
 
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