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If it's simply a slide and not in of itself a F/A part (or a part that makes the gun F/A), then I'd almost have to think that it would be one of those situations where it (pre-86) could have been...

I have to wonder if this might be a situation (similar to what happened in HK and AK land) where, although registered, the part cannot in fact be used on a firearm not registered as a MG because...