Google isn't providing me help today and honestly, I can't wrap my head around the actual statutes to make sense of exceptions and requirements.

I recently picked up a GSG-5PK and am considering converting it to an NFA item. I just want to run my potential plans by you guys to ensure my thinking is correct.

Adding a fixed stock to this pistol creates an SBR but will adding a folding or collapsing stock create an AOW (since it can potentially be less than 26")?

Regardless of the stock type, if I also add a VFG, this creates an AOW, correct?

And while I'm thinking about it, once registered as an NFA item, it will ALWAYS be an NFA item, correct? That is, if I were to pull the stock/VFG off, it still couldn't be sold as a regular firearm, correct?

Thanks.