As a long time Inokatsu M4 user. I can positively say that the 2012 versions are not good out of the BOX. It has a weird hop up system that you need to take the barrel off to adjust, pot metal internals, leaky mags (both prowin and G&P), and a hopup chamber that keeps breaking every time a jam happens (mine broke last week again for the umpteenth time). Once you upgrade all internals to steel (most of them RA tech upgrades), switch the hop up unit to a standard WA that you adjust from under the barrel, modify a steel washer to replace that stupid e-clip that can never keep the nozzle attached to the bolt and you figure out that you need to use harder BB's (>.30g) to minimize bolt getting stuck from chomped up bbs, HPA tap/leak proof all magazines cause the gas efficiency is horrendous, and hundreds of dollars later (with an HPA tapped drum mag) it's an awesome gun to take out into the field that gets all the attention. Everything becomes more reliable. Except I can't find a good hop up unit that can survive a jam and takes me out of the game more often than I would like. If I was in your position selling it off is cutting your losses. I however, somehow enjoy working on my M4 trying to make things better and more reliable which may be an unending process. I probably would try a viper tech if I wasn't to deep in the hole on this inokatsu because maybe they succeeded in the design where inokatsu failed.
TLDR: Inokatsu sucked but I made it work-ish, viper tech might be a better gun?
