Thanks Alan ! i dont know hard it is to get Firearms ,parts etc out of the UK ,i also contacted Graham Spraggon ,he can get Lothar barrels in 600 [thought you couldnt, but you can in 600]]Heym would have to come throught the dealer/agent for Heym here[whoever they are ? might be Hermann ? ],no doubt,Heym would want arm and a leg for them ! so im thinking the Lothar Walther
Cheers and thanks