My buddy who is now serving a stint in the pen for having wayyyy to many fully auto's rebuilt one for me. I, not knowing much about guns am probably going to be corrected here but it had 3 different barrel sizes(I only shot the .50) and some kind of specially built recoil to it. Before I could purchase it from him though it got confiscated when he was raided. We took like 17 different handguns/riffles to ocala national forest and shot the shit out of an abandoned car, soooo much fun. The DE was so much fun to shoot but I do agree with knyte, it is a powerful pointless gun. If I remember correctly the one I had(shot once, lol) was like 4 pounds.