I would argue that a loose frame/receiver fit would very possibly affect accuracy. The shooter is holding the frame, and aligning the sights, which, of course, on a Luger are all on the upper receiver assembly. When you fire it, if the receiver is loose in the frame, it would allow the receiver to flail about, and put the bullet wherever it is pointed when the bullet leaves the barrel. The same can be said for a rifle that does not fit the action tightly in the stock.
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