The early ones have a "pot metal" barrel bushing, use a magnet to check. If you have such contact American Tactical and they will send you a FREE replacement.
Shooting wise we have had excellent results, these things eat anything we have run thru them. As for accuracy my oldest can split playing cards at about 30 feet on a fairly regular basis.
John Ed
John,
Have you had any operation issues? I had heard the slide was hanging up on some of them. And to watch out for an extra spring when you take it down.