Walther P22 is a nightmare from what I've seen, very particular about ammo brands and still iffy. Never seen anyone with an SR22. Most people with 22 pistols have a Ruger 22/45 and the verdict for those is great. Highly accurate, fixed barrel attributes to that. Blowback operated with no slide. Grip similar to 1911. My only gripe is the absence of high cap mags. 10rd is the most you'll get.