Its Ofna based but I doubt it a monster pirate also. Ofna was famous for using parts from different vehicles to create a slightly new "version" of something so many look similar but are very different. As an example, the front knuckles from a Pirate (and the buggy its based on) look very similar to LX/Ultra buggy knuckles, mount the same way, but are in no way interchangable. Ask me how I know. The front and rear arms (upper and lower) are different from a Pirate and appear to be from an early LX/Ultra series buggy. The rear knuckles are very obviously not Pirate and are definitley from a LX buggy. The chassis is definitely not a Pirate, it has the rear center diff mount holes offset to one side which the Pirate doesn't. To be honest I don't know of any Ofna with the rear center diff mount offset like that, and the countersunk holes behind the motor are a real mystery. What went there??? But besides the chassis plate its screaming early Ofna LX/Ultra series buggy to me, and I've had a couple of those.