Sorted the hop up, but I must be cursed, had my first airsoft day Saturday, was really looking forward to it, mate picked me up, we arrived and then it went wrong, wrong being the MSK Polymer Mag was venting gas at an unbelievable rate, had to borrow one of my mates rifles and put mine back in the car, gutted was an understatement. I will have to take the mag to an airsoft shop to be looked at, more than likely the O ring is buggered, oh well better luck next time, but loved the day, was a great day