I would like to purchase an dedicated .22lr rifle in an AR configuration. I would rather not have a cheap polymer upper or lower receiver. Looking for all metal, but as inexpensive as possible.
1. Is there a high quality AR-22 available for purchase that anyone knows of;...
Yes, but it will be more expensive than a very cheap AR in 5.56.
2. If I were going to build an AR-22, where should I look for the receivers and parts. I've built a number of AR-15 rifles, so that part is not new to me.
Then that's what you should do. The premium for a "factory" built upper isn't justified (imo) except for the Palmetto State upper when it is $250-ish, and then it is only a value if that's the configuration you like.
I can give you a build list for a CMMG based upper with a heavy taper barrel from which I've gotten good accuracy (less than 1.5inches at 100 yards). For maybe $80 more you can get a Lothar Walther barrel instead. I have one but haven't had testing friendly weather yet.
$160 + s/h CMMG BCG and collar from Right to bear
140 Heavy taper barrel from Optic Planet
50 Anderson lightweight upper
5.09 thread protector from ebay
40 free float tube and barrel nut
40 Anderson lower
40 RediMag Better mag adapter from Redi-mag
40 LPK
105 Larue two stage trigger at AR15.com
45 3 ten round short magazines - Midway sale
50 stock
15 cheap carbine receiver extension (no buffer or spring are needed if you are willing to just cut a dowel to length)
$730.09