I just got a model 10-5 with the pinned barrel and I'm guessing its the 3 screw... What can u guys tell me about this.. It's my grandfathers who passed away 2 yes ago ... It's in 80% at least can it Handel the rare use of + p? Should I pickle it and put it away? It has the original grips everything is factory... Also what year was it made ser# c978***thanks guys Jay