So, I've been daydreaming about the day I can finally get rid of the chains CA has on me again, and i had a thought. I already had plans of taking an AR pistol and SBRing it so I could put a stock on it, when I started thinking about an SBR in a different caliber, and a question formed that I'm hoping someone can answer. Here goes.
I know when you get approved for the tax stamp, you have to put some specific engraving on the item in question. What I don't know is if you can have one AR lower that you can use for multiple caliber uppers, both (all) of which would create an SBR when used? Or does each SBR need to have a unique lower? On the one hand, lowers can be marked multi-cal, but I believe SBR engravings have to be a bit more detailed?
Any information is appreciated.
I know when you get approved for the tax stamp, you have to put some specific engraving on the item in question. What I don't know is if you can have one AR lower that you can use for multiple caliber uppers, both (all) of which would create an SBR when used? Or does each SBR need to have a unique lower? On the one hand, lowers can be marked multi-cal, but I believe SBR engravings have to be a bit more detailed?
Any information is appreciated.


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