I've got a Bushmaster that I've used as a patrol rifle for the past several years. It lives in a soft case and gets carried from cruiser to cruiser. Mine is the XM15E2S, almost a clone of the A2 I carried for many years in the Army.
I don't have any gripes about the little rifle. I use iron sights, run factory ammo through it, and have good magazines. It's accurate, dependable, and handy.