ok when i shoot in semi or full auto withhop up the whole way with most back spin it shoots about 5 bbs ok then the next few just drop and then it will go back to working fine and then again with no back spin.. i took out the hop up to see if maybe the spacer wasnt pushing down on the sleeve but everythng looks like its working fine.. what could i do to fix it? and also 1. would Classic Army hop up work in ICS? 2. whats the difference between hard and soft hop up bucking besides that ones hard and the other soft?