After a bunch of research I just ordered a Weihrauch HW50s in .177. I've never had a Weihrauch, and many of the forum posts and articles are accompanied by pics showing different stock designs; one conventional-looking with right-side cheekpiece and one with the new style double cheekpiece and cutaway bottom. What was the timeline for the stock change, and were there mechanical changes too? Some of the older posts seem to reflect lower muzzle velocities, and I'm wondering if it was a different gun some time ago.Any history on this gun will be greatly appreciated.