I can't say enough bad about Dragunfly markers. They are the worst marker I have personal experience with. My brother bought 3-4 brand new Dragunfly electro cockers to re-sell and use as loaners. They did not work out of the box, mostly because the pneumatics were complete garbage. He replaced the lpr regs on all of them with WGP units to get them shooting, but he had some switch problems too. They also look and feel exceedingly cheap overall. If memory serves they were threaded for spyder barrels, but I may be wrong on that point. Anyway, they are not 100% cocker compatible. I can't believe how much that one sold for, someone will be disapointed.