yes lilshank's thumper is a freak of nature and has had little in the way of problems. i will say that when i ran mine on co2 last weekend the velocity jumped around a little more than i would have liked. may have to eliminate the internal reg and set it up for HPA only. will have to see again a different day.
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9mm will make you weak!
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CCM Works Sniper, Thumper, Kingman Hammer Low Pressure with Vertical ASA, TPX, Ion mech/closed bolt