any one no about powermax hipac systems can help me out .bought a rifle from a guy and he done a custom job based on 2240 it has a shrouded 24 inch barrel with bnm breach .any way went in the back garden to try it out so it only fired 2 shots and no air letf in rifle .so i went and filled it up 200 bar so when it got to the 200 stop so thought it was filled .so i tried to fire no air tried again same .so gave the guy a shout who i bought it from to help me out . so he came this morning down to the shed so i said how does this set up work he said fill it with air as i said to him i have done t