In all honestly, I wouldn't buy more than a barrel for it, and the barrel I would get is a J&J Ceramic, and having it 16" at the longest. Longer barrels don't mean more accuracy, just a heads up.
J&J Ceramic barrels never stop amazing me with quality and performance.
If you really want to do things to your marker though, you can modify it, but again, I wouldn't buy aftermarket parts for it. Just modify the stock parts and you will have a decent gun to shoot people with!!!
