That trooper is giving you advice that is not consistent with MSP advice.
They have stated that the barrel must be advertised and sold as a HBAR. It does not have to be marked as such. (Although it certainly helps)
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That's what I meant. He said the manufacturer has to advertise it as a "HEAVY BARREL" unless it actually has those words either in an online ad or on the barrel itself, it is still in a grey area.