The wrath has many ups available right now. One upgrade you need is a new bolt. The delrin bolt is prob. the best bolt out for hte wrath right now. You can find that bolt here....
www.zoompaintball.com . Another upgrade would be the t-board, the t-board is a really good but sorta expensive upgrade it really turns your gun into a machine gun

. There are also many chips out for the t-board like... the t-chip, ramping chip and the new ultra-chip. I would recommend the ultra-chip. You can find the t-board at paintbalgear.com in the diablo parts section. Another upgrade is the trigger. The stock trigger on the wrath is good but if your looking to raise ur bps i would recommend the fbm "original" or "wavy" style triggers. You can find them here
www.fbmfactory.com . I have the "original" style and i can def. tell it raised my bps but the "wavy" style is cool also. You don't really need another barrel unless you have the money. I would recommend the proto barrel 14" or 16". Its cheap and its very accurate. I don't think there are any feedneck upgrades for it but if there is that would be the next best thing. You really don't need another reg. because the stock one conserves alot of air already. Unfortuantly there aren't any after market grips for the wrath but hopefully there making some now.