got a old series mini 14 with a broken extractor. Replaced parts now it will not fire the second shot. fires first round, feeds second round ok, pulling the trigger produces a click, but firing pin does not strike primer. Any suggestions on were to start. This gun came to me in pieces from a gunsmith that couldn't find parts so it maybe something not assembled right. Hate to send it off if it is something simple. THANKS in advance Donnie