I’m a convert
A bit back, I picked up a AR-15 22LR conversion kit (available at Brownells). It’s a drop in unit that allows you to fire inexpensive 22LR ammo from your AR. Simple math makes it worth it. Inexpensive 5.56 ammo is $0.22 per round. Last time I was at WalMart, I snagged a box of 550 rounds of Federal for about $16, or $0.03 per round. The conversion unit is priced with a magazine at $180. So, after one case equivalent of 22LR, it pays for itself.
Took it to the range Saturday in Junior’s pink AR and ran 3 magazines through it. It ran perfectly. I was hitting clays at 30 yards with it easily (not flying, stationary). Next, I’ll give it a go with some subsonic ammo.