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Multiple uppers for SBR lower
I'm waiting for the tax stamp on a factory SBR in 5.56. Once it is my possession can I purchase a short barrel 300 blackout upper and use the 5.56 lower?
My understanding is it is OK to use a different upper of the same caliber, I'm not sure if you can use a different caliber. I don't see why not but I don't work for the government either.
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