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KaPow! Warpath needs more weapons so Wheeljack was happy to build him some new weapon systems to help defeat the Decepticons. The KaPow weapon system allows you to mount the weapon in Warpaths hidden fist while in robot mode. All KaPow weapon systems utilize a peg that fits standard 5mm holes so even if Warpath isn't using a KaPow weapon someone else can!
The Saw blade does actually spin when mounted in the holder. If made in something other than "Strong and Flexible" type materials becareful when putting the saw blade between the mount points. This way you don't break the mount points!