They are very close in relative size and weight, with the Ruger being perhaps a smidgen larger and heavier, but not enough so to matter:Our Team Said: We really enjoyed the P22 Walther, wanting only more accuracy from it. The feel, function, looks, balance, and light weight were ideal for fun shooting. The good triggers, both the smooth 9.3-pound DA and clean 4.3-pound SA, made that a joy. Does it have enough accuracy? Maybe, depending on your use for the gun.
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Our Team Said: We ended up being not so fond of the Ruger. The SR22’s trigger put us off. It annoyed us to much we tried an old gunsmith’s trick on it that helped it a lot. With the gun empty of all ammo, we put lots of thumb pressure on the cocked hammer and pressed the trigger until the hammer fell. We did this a number of times and that took care of some of the creep. If the trigger had been clean and a pound or more lighter, we would have liked the gun better. We found the magazine release to be annoyingly hard to use. Either the buttons need to be longer or the frame needs to be relieved to make it easier to change mags. The Ruger had no problems with feed or function with good ammo. Like the Walther, it ran 100 percent. We did not like the DA trigger at all. We did like the sights, the workmanship, the two extension-type magazine bottoms, the zip case, and the comprehensive manual with its wonderfully detailed exploded view.
The Walther is about $20 cheaper than the Ruger. Accuracy was fairly comparable. They gave the Walther an "A" grade, and the Ruger a "B".
BTW, I can't rate Gun-Tests Magazine highly enough. They take no advertising, so they calls 'em like they sees 'em, and they're not afraid of puncturing anyone's cherished shibboleths.