i was cleaning my p95 and noticed what looks like a spot where the slide wast cast. its inside my slide down underneath where the barrel goes. its a small swirl that about 1/4 inch long, its not a crack as i looked on top and its not thru and its not very deep either but a tooth pick will catch. is it normal to find casting flaws in the slides? i've fired this gun about 50 times and it performs great just didn't notice that spot before. i tried taking pics but i just get glare, thanks for any help.