so, when reassembling my SU-16 TAC(Canadian version of the SU16 E), and while i was sticking in the end of the piston head to the gas head, i kind of tryed to slam it in. it made a small dent in the top of the gas head, and when i mean small i mean like a half to a quarter of a millimeter right around the top edge. I realized that the reason it wasn't going in was because the bolt was not all the way extended, so i reextended it, and didn't have to force it through the next time. Is my gun broken now? should i replace it? it is a ridiculously small practically unnoticable dent.