It's not that easy, as a lower for what the UK call a section 1 firearm like this would have to be on your licence as the licence stipulates the type and number of firearms you are allowed. It would also need to be shipped to a registered dealer in the UK then added to your licence and the police written to and informed as well, which means I would actually either have to sell my current lower first or apply for another one on my licence and to do that I would need a good reason to have 2 of the same type. My licence even states the exact calibre and type of firearms I can own along with the amount of ammunition I can posses (except bird and buckshot) and also what I can do with them, for instance my akdal can only be used for target shotgun and clay pigeon shooting and my 223 can only be used on approved ranges for target shooting only.
Unless of course I am miss reading the uk firearms law.
Sorry just realised hijacking this thread, please just PM me if you have any comments on this.