I have recently bought mine cyma tri-shot springer and after one game using it I've gotten an issue with the pump lock. When unloaded, everything works fine, it dry-fires without any issues but once i load the shotgun with bbs and pump back, it loads three bbs in the chamber, but when i move the pump forward, it won't lock the pump and the trigger won't engage. Could there be an issue with the inti pump latch or the spring on it?