The extension has had some work done at one time. Likely it came loose and had to be re-attached.
The screw being a bit off is something that i have seen before. Even on guns that have no evidence of work being done.
The extension was soldered and screwed on after the barrels were assembled. The screw head was dressed down flush as to eliminate the screw slot. And then everything was matted together.
I suppose that with shooting, the screw can gradually work its way loose. Fixing it would be pretty involved.
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B. Dudley
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