Can I use my lower while waiting on SBR stamp?

Yes. It’s not an SBR in that configuration
 
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Even after it’s approved you can use it that way. Heck, you can sell it without any paperwork before or after it’s approved.
 
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…and if you change your mind, you have 3 years from the date you paid the tax to ask for a refund. All you have to do is say you never made/configured it into an NFA firearm.
 
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