When I got my S&W 15, the trigger was perfect - crisp, clean, consistant 3-4lb pull. I took it apart completely except for any roll pins/tension pins. Back together now and the trigger is waaaay too light. I can barely touch it before it fires. I can even push on the hammer to make it fire. I'm 100% positive I did not misplace any part, however could I have put it back together wrong? It almost looks like there isn't enough metal left on the hammer/trigger release. I don't want to take it to a smith because I only paid $70 for it. Help.