.22 lr upper??

[stokesrj]

It really depends upon what you want to do with the upper, just plinking, then the solutions above are good enough. If, you desire really precise feedback, there are a couple of companies that build .22 uppers for the National Match High Power crowd to practice with, Compass Lake Engineering, and White Oak Armament. They both build the uppers based upon the US Army M261 conversion kit but with a dedicated match barrel rather than the chamber insert. These use standard 5.56 AR15/M4 magazines with an insert. I used a Compass Lake Engineering version with a Krieger Match Barrel for several years while working on my Distinguished Rifle Badge and it performed well, one hole groups with Wolf Match Target at 50 yards and 1/2" at 100 yards. These are more expensive and are relatively readily available in 20" A2/A4 service rifle configuration or NRA match rifle configuration, but would need to be special ordered in any form of tactical configuration. http://www.compasslake.com/index.php?mai...gs908fi4r5
.22 LR ammunition is readily available at $0.14 per round and up. Just the promotional (cheap) stuff is unobtainable. I'm currently going though 500-1000 rounds a week training for my Distinguished Pistol Shot Badge from my Marvel 1911.
Bob
PS Palmetto State Armory has S&B for $0.08 / round in stock today.
http://palmettostatearmory.com/index.php...brick.html