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You have to change the barrel and hopup to the american style (non-ball bearing) The new style barrel has an extra notch around the barrel where the tensioner arm clips on to that the ball bearing style doesn't have.
What Boobie did on YouTube was dremel out a channel for the ball bearing inside the new style hopup chamber.
As for the Evo II being sold out, I got mine from Airsoft Taiwan, I actually bought the $40 kit that comes witrh the whole hopup and barrel for the m9 or g-series, and just took the arm, rubber and steel sleeve, and put the barrel and chamber aside.
Only downside with the Evo II, is that it has a really strong hop effect out of the box, like almost overhopping .3's with the hopup dialed off. So you have to (CAREFULLY!) bend the arm up a little bit, so that it's not pushing as far into the barrel right away. Gonna take some tweaking, but the difference in range/accuracy is stunning, and since I've had lots of issues with the stock brass arm bending all to hell, it's nice not to have to worry about that.
As an aside, I'm hoping to do the bolt catch mod on mine this weekend. I don't often release the bolt with the charging handle, but it bugs me that I don't at least have the option :-) Also thinking of doing the mod that adjusts the length of trigger pull, but we'll see how much courage I have with the dremel in my hand...
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