I have the 22A with the 5.5 barrel. Bought it used and extremely dirty. Still shot well but failed to feed 5 of 200 rounds. Cleaned it well and it only failed once in the next 200 rounds. If you use standard cleaning it needs to be cleaned every 250-300 rounds. I found that using Frog lube increased that time to over 500 rounds. We put 500 rounds through the gun on the last outing without a single failure. Not planing on cleaning it again until it fails to feed. Just want to see how long it will go...
Swapping the barrel is a piece of cake. Push one button and the entire top come off in your hand. I'm looking for a 7in barrel for mine right now. I'm very impressed with mine and would highly recommend it.