with tax season fast approaching and my rifle becoming longer ( m4 with 509mm barrel ), i have decided to go ahead and push over 400. since this will be a dmr, obviously certain restrictions will now apply, as in semi auto only. im getting a guarder sp120 tune up kit. this should put me right around 430-440. i was going to just upgrade the cylinder set, but i dont believe ill achieve any higher fps thru it. any ways, once i start my upgrades i will be keeping a video log, as well as a written log...