I was givin a pt140 mil pro. Not at all like my sig... It was given to me because it won't fire. Or strip down. Or dry fire. Or cock. It seems to be intact and fully functional. Except it doesn't work. I'm not used to striker fired handguns. I'm familiar with my sig229e2 and my duty pistol(m9). Please help me get this gun up and running. I am at a loss with what to do if I can't even field strip it.