1938 S-42 questions.

[c141b]

I just bought this luger over the holidays and I would like some feedback on this model. It has a ( i ) by the serial number. It has one droop wing eagle and two stick wing eagles. The barrel has been replaced (rc) on barrel. The magazine has an m and 8 on it? I don't know much about the arsenal repair procedure, what’s that about. All numbers match except the barrel, hold open latch, firing pin, trigger plate assembly on the inside. Had to buy new grips. Went to the range and it shot fine for me but it stove piped when my friend shot it.