If it found its way to Britain bearing German marks on the odd barrel then it would have had to go through our Proof House at that period of time. So it sounds as if it has been about a bit. You may be interested in the book 'The Classic British Rook & Rabbit Rifle' by Colin Greenwood. It is less than 20 and copies are easily available. There is quite a bit about the A & D action rifle. Lagopus.....