I'm seriously considering getting a 22LR conversion for my AR so I can get more rounds through it at an indoor range. So I have a couple questions about them.
1) Is there a overwhelmingly favored brand?
2) Do you have one, do you like it?
3) Will sighting in at 25ish yards with 22LR be even close for the real ammo?
4) I've heard 22LR is dirty, how dirty is dirty?