Just mods, no ugrades really required. Cut a couple coils off the striker spring to make it a bit more consistant, and free float the barrel by removing the aluminum mount that attaches the stock to the outer barrel at the front-most sling stud. That will let the barrel sit as it wants to (mine and others I have worked on, sits a bit to the left, which means that when held straight, the inner barrel has a slight bend to it). Stock, it comes with a 6.05mm inner barrel, so you dont' really need to go around looking for a tightbore. And duster / propane is what you want to use in it, with a bare minimum amount of oil used. Green gas puts oil into the barrel every shot, greasing up your hop up and makeing your shots suck. Oh ya, barrel cleaning with a dry patch every 20 shots really helps keep it at it's best!
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