Some parts are considered full auto weapons in and by themselves, or in combination with other parts. An M2 carbine kit IS an NFA firearm, even if no M1 carbine is anywhere around. So are other single or combination of parts for other guns.
It can be confusing. Not too long ago, I saw an ad for DIAS's, saying they were "legal to own" and "no paperwork". True if they were made before BATFE declared them to be themselves machineguns. But while they may be "legal to own", if they are installed on a host firearm, or the owner possesses a suitable host firearm, they are illegal.
So, uninstalled parts could very much be an issue.
Jim
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