I think that this WOULD likely be news to the German gunmakers. Heym does it the same way everybody else does, and they certainly don't use any "device". All of the British and European DR makers that I know of do it the same way - with the forward hand resting on a bag and the gun fired from the shoulder with no other rest. Some (like Holland) use a standing rest, and some (like Purdey) use a regular bench, otherwise they all do it the same. I've never heard of anyone using a "device" of any kind. If true of Krieghoff...well then they're unique and I'm glad that I've never bought one of those.

Mickey is right. If you value the gun and want it to shoot well, avoid the Lead Sled. A dealer friend of mine sold a .470 to a client who sent it to the most famous of the custom cartridge companies to develop a load for it. They shot it in a Lead Sled and said the gun wouldn't shoot with anything they tried. It tore the recoil pad all to hell, happily without breaking the stock, although I can't imagine why it didn't. My friend took the gun back, replaced the pad, and took it to the range to see what the problem was. There wasn't one of course - it still shot perfectly with Federal factory ammo. You just can't expect a double to regulate properly in that kind rest. Even if it would, it isn't worth the risk. I've heard of too many broken stocks with those things.