I just picked up my M&P 45 on Monday, and I have disassembled it several times and what not. Tonight, when I was cleaning it and taking it apart(again), I noticed that inside my barrel in the grooves there is a bronze/brownish colored substance. Also, there is a little bit of the same stuff around the firing pin as well.
Is this typical of a brand new firearm? Or could it even be rust?? (I cleaned my barrel late last night with solvent, but for forgot to run some lube down the barrel until today once I got back from class. A night without lube shouldn't cause rust in the barrel if it has just been sitting in my room, should it?)