Think that the forum that has more information that you ever wanted to know is ar15.com. Don't know which one of the conversions works the best, would recommend doing a little research. There are are also different vendors and not all are honorable places to deal with.

It is good to know that you are going to have a gunsmith "tune" the conversion they are supposed to work with most but slight manufacturing differences in the bolt assemblies and the many AR variants can make the conversions problematic at times. Accuracy is not real good, don't know if it would be good enough to hunt with or not. You can also buy a new upper with a 22 barrel that seems to offer a much higher degree of accuracy but also adds quite a bit to the cost. Think a built 10-22 might be cheaper and be very accurate.

Should mention that a couple of years ago i worked at a machine shop that fabricated the conversions for one of the AR-15 specialty shops. Did like our quality control testing for the conversions that we made. The owner of the AR-15 shop is a class 3 dealer and he would bring in his personal silenced M-16 and we would go out behind the shop and run a few magazines through it just to make sure everything worked as it was supposed to. And most of the time the conversions would run full auto without any problems.