Newbie to this site, getting back into firearms after having sold mine many years ago. I've been searching for a .22 LR and am considering purchasing a Walther PPQ 22 4" pistol. Is it a single or double action firearm? I've gotten and seen some contradicting information. A clarification would be most appreciated. Also, I noticed one online dealer will sell this model, but will ship it without the 12+ mag. Does that mean that I'll have to buy the mag separately or will it typically ship separately? Great site!