Appleseed is apparently very good for getting people up to speed. I am a big fan of using .22 LR sub caliber guns for training, general proficiency, and just plain fun at any age...

I am coming up on 6K rounds through my 15-22 (and have bought 3 others as gifts). That Appleseed is down on them is odd indeed.

For my money the best accessory for a full calibered AR is a 15-22 set up to match the "big" gun...