Went and shot my Hellcat today for the first time. I've had it for several months and had only shot 1 round out of it. Today when i started shooting it would only fire 1 round and then i couldn't pull trigger back to fire next round. It ecected the spent casing and cycled next round but would not fire next round. 2 of us tried with same result. When we racked another round it would fire the first round again with same issue with next round. Any ideas would be appreciated.