So last month I chose to purchase the D3FY marker over the Etek 4 (I'm regretting that decision now) and took it out for some fun. Had trouble with balls getting jammed because of ball detents (D3FY sends 2 different size detents for marker). I also thought that I had a leak somewhere on the gun, but D3FY tech told me that with a 48/3000 tank, I can only shoot around 600 rounds. I called D3FY tech, told them about the issues above. First let me say that the customer service these guys provide is awesome, so I did everything that I was asked to do, like change the detents, they also helped me with reprograming the board to its original setting and also ended up buying a new 68/4500 EXPENSIVE thank. Here is my huge issue!! I went out with a group today to Warped Paintball and this gun took a huge sh1t!! I turn on my hopper, turn the marker on and the gun literally starts firing on its own. It must of shot over 15 balls before the air on my tank blows (leaking) the hell out of the gun, WTF! The tank till now is still holding the air so I know that was not the problem. Its hard to believe that the gun these guys rent, which I did have to pay for, gave me no problems at all. Since I bought this gun, its been nothing but problems. NOT A HAPPY CUSTOMER!!