Yea, all barrel made for the spyder will fit the piranha, the threads are the same. I found that the spyder barrels a shorter at the base, so you screw in in more. This opens up a whole world of aftermarket barrels to you.
i tried fitting my friends Dye Aliminumn barrel onto my friends STS and it did not fit for some reason. I know its supposed to fit, but it did not screw all the way in. do any of you guys know why this would be???
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