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Thank you Jeff.

I have assembled several SBR's after an approved form 1 is in hand. The caliber on the receiver matched the caliber stated on the ATF form 1, and consequently the designated ammunition was utilized...

Thanks Jeff. So on the form 1 the caliber well be 9mm ?

In the planning stage to build a 9mm AR SBR. I happen to have a Bushmaster AR-15 lower with the caliber 5.56 or .223 already manufacturer engraved.
Well I need to remove the 5.56 or .223 and engrave...