Other day at a game we were lined up to crono the guns. Infront of me was some guy with a full ghillie suit and a highly upgraded sniper. When he shot his gun shot at 825 fps. They told him he couldn't use it so he went back to his car did some modifications on it and brought it back. then it hit 600 fps and they let him use it. When he was walking past me I heard him say he only lowered ammount of gas in the gun and put in much heavier bb's and didn't tell the people at the crono that.