[scoobabob94]

Ok, so I've had this problem for a long time but I havnt played airsoft all winter so I havnt bothered to fix it. On my Sig it has been double feeding every other shot on semi auto, and I believe it is because my air nozzle dosn't fully cover the bb inlet. I used a flashlight to light up the bb inlet where the magazine loads the bbs in, and I fired a few shots in semi auto. The starting position of the nozzle is about halfway covering the inlet, upon pulling the trigger the nozzle moves forward the rest of the way to cover the whole bb inlet and then resets to its previous position. Now I'm no expert but I'm smart enough to know that something is seriously wrong, but how can this be remedied. I'm using a guarder Sig series air nozzle (I checked it, its the same length as the TM one), a guarder steel cylinder head, and a stock TM hop up unit. I upgraded carious other parts too but I dont see that as being a problem. I'm thinking that the problem is either coming from the hop-up unit, the nozzle, incorrect timing of the gears, or could it possibly be a bad shim job?(this was my first time shimming a gear box). Any advice would be greatly appreciated.