joules

Hi all, Long time lurker first time poster. So I've recently upgraded my CYMA 701b with the following parts: Maple leaf crazy jet 428mm AA chamber ML Autobot 60 Panthera nub AA cylinder AA cylinder head AA blue piston AA spring guide AA M130 spring AA zero trigger My local site has a...

Hello everyone! I tried to find if there was already a thread on this but couldn't find any. Does anyone know how to calculate Joules? I don't mean with some online calculator where you just type in the fps and bb weight and it tells you the joules, I mean the raw formula that I could plug in...