i have a Walther P-22 that I purchased some years ago (4 digit sn). It worked like a charm for quite a while. The last 3 or 4 years it has had feeding problems, mostly the slide stopping forward movement with the round on its way to the chamber. Most of the time I can push the rear of the slide to chamber the round. Fewer times I get live round stove pipes. This started happening with both magazines in the same year. I note the ramp leads up to the sharp edge of the barrel where it appears the round hangs up also where the frame hump thingy engages the slide (technical talk)...I know this shooter has a somewhat spotty rep, however when it's working it's a hoot to shoot. (poetic) Any help would be appreciated.