If he want to game it,it's easy enough to have a second upper cyl. to switch out in a few min. BUT an ICS gear-box won't live long shooting @ 550fps. Try it and find out lol. Mines been going for the past 6 years shooting @ 398 fps on .20's(but I use .25's). ICS gear box does not like shooting too much above 400 fps.
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Death Before Dishonor" Bleeding Black Label"
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