I’ve spoke with NWCP about a new receiver and was told that all uppers, lowers and bolts need to be serial numbered now and proofed.
Looks like this is maybe not an option now as a simple purchase of a receiver and swap parts over.
If this is the case then I am thinking I can keep the lower as that is what has the serial number that is on my licence and ask a RFD to purchase a new upper that I have found on Brownells and be sent to them. I can send down my rifle and then it can be dismantled and reassembled and then off to proof. The RFD can then scrap the old upper and nothing changes on the licence.
once Dave emails back I will ask about this.
if anyone has any other thoughts or options, I am open to anything.