FireBirdDS
Expert
Most all of the .22LR AR-15s I've seen thus far seem to be so dedicated to .22LR only that they are made of polymer all over and are somewhat undersized. Are there any AR-15s out there sold with .22 uppers that have a mil-spec lower receiver that can accept a standard 5.56mm upper? Or is it just as well to purchase a lower receiver only with a .22 upper?