The mods were pretty simple. Just drilled out the valve port and barrel port and then the biggest modification for speed gain was the easiest of all. I just swapped out the overpowered hammer spring for a Stormrider hammer spring. The Dragonfly hammer spring is making that hammer wack that valve stem so fast its opening and closing super quickly then draining the rest of the air out because the hammer spring is stronger than the valve spring and whatever air is left over. So with the stock spring after five or six pumps you're not really gaining much. With the Stormrider hammer spring it is hitting the valve slower and opening the valve longer so you get all the air out the barrel in one shot and it seriously increases velocity. If you take your Dragonfly and chopped some of the spring length off a few coils at a time you'd see the velocity jump way up.
A lot of times that's correct that a more powerful spring will give more power but if you have a short valve stem then it's a balancing act. Too much hammer spring and it opens and closes that valve super fast so only a small amount of air gets up in the barrel. Too little hammer spring and it can't open the valve fully. So it's in between that is optimal. The Dragonfly has way too long and stiff a spring.
You're talking about pumps more than the suggested 15?
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