So - I'm very new to the gun collecting scene. I already have a shotgun for home protection and am interested in picking up one of the AR-Style .22's this weekend at the gun show at the Expo Center in Portland. I've been doing a lot of reading online and have narrowed it down to one of the following: S&W M&P 15-22, Colt M4 .22, Sig 522, or Ruger SR-22. There's also a VERY inexpensive one by Mossberg, their Tactical 22. The first 4 are all between $400-500, the Moss is only $225. I of course completely understand I'm basically overpaying for a simple 22 to have the AR looks and feel (somewhat) but can't rationalize paying for .223 rounds for something I just want to take to indoor/outdoor ranges and cheaply shoot for fun in my spare time. Again - I won't be using this for home protection and at a later point plan on getting an AR-15 that will rarely be shot (thanks to ammo cost). Do any of you have any of the above guns? What are your thoughts on your purchase and what do you reccommend of the group? Seems like these are getting more and more popular - and since everyone should own at least one .22 this seems like a fun choice.