I owned one for a little bit, it was a fun rifle but expensive to feed. Recoil was stout but nothing unmanageable. I had a 16" AA upper that was pretty accurate and I'd recommend it for anyone looking for something that hits hard at close range (>200 yards).
What do you mean by a conversion? If it's just putting the upper on a good, milspec lower, you'll be fine.
Good equipment will never be a substitute for good training.