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honestly, i think its impossible even if you drop in all the after-market parts. i think you might have to custom make parts. the highest after-market upgrade i know of is the Airsoft Surgeon 380fps kit for the KSC MK23. If you have that, a tightbore, teflon mod, high-flow valve, and air-seal hop-up chamber, TOP gas and a REALLY warm day, then you MIGHT, and i stress this point, be able to hit 400fps with that.
dont get me wrong. if you can do it, than that is awesome, and you must post pics of the gun, crono results, and the list of upgrades you used. good luck
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