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I recently acquired a Mech Tech CCU chambered for a 1911 A1 .45acp and now looking for a .45 pistol and the OP is somewhat startling. My barrel is
16.25 inches long, which is a 1/4 inch over the minimum. Do I have a problem when converting and possibly reverting the pistol ?
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I am not fully versed in the law, but my understanding is that once you take your pistol, add a long barrel and a stock, it becomes a rifle, for ATF purposes. When you revert it back to a pistol, it is now a pistol made out of a rifle and that requires ATF approval (and I believe a tax stamp for an SBR).
While the US v Thompson Center Arms case, would suggest that you can convert back and forth, the ATF has taken the position that this case applies only to the TC pistol kit (I'm sure someone with better search skills knows of a link to letters from the ATF which state this).