AR style .22?

[SlushPup]

markings don't mean ****. it can say 50bmg it can say 100bmg it can say whatever you want. what it will fire is what matters.

yeah, that's what i meant to say..

[Grumpyoldretiredcop]

If you want to get the best groups possible, go for the dedicated upper. Spike's uppers can be ammo picky (mine was), but accurate. I don't have any personal experience with any of the others.

If it's just plinking/practice you're looking to do, a conversion might be acceptable and more economical if you have a 1:9 twist barrel. The accuracy of conversions in 1:7 barrels seems to leave something to be desired according to every comment I've seen so far.