The ZfK-55 is basically a K31 action, with a bunch of modifications to convert it into a very nice marksman's rifle. The more obvious changes are the muzzle brake (very reminiscent of the second model FG-42, which makes sense as the Swiss experimented with those rifle quite a bit after the war), pistol grip stock, bipod, and 3.5x optical scope. In addition, the barrel is significantly heavier than a standard K31 barrel and the whole action has been rotated about 15 degrees to allow clip loading and ejection without interference form the scope. A clever and quite Swiss solution to that problem! Most other countries either simply abandoned the ability to use stripper clips in their sniper rifles (like most Mausers) or offset the scope on the side of the receiver (like the M1 Garand and Arisaka). Rotating the action allows the best of both, with easy loading and a center-mounter scope, at the cost of simply being more expensive to make. Anyway, I took some video of the rifle, which will hopefully help folks get a better feel for them. I am really looking forward to being able to shoot one of these some day! http://www.forgottenweapons.com