I recently purchased a BNIB SIG716 (lets ignore supplier for now). Today I took it apart to totally remove all factory oil and fireclean it. However, I noticed that there is carbon inside, lots of it. It is normal for BNIB rifle to arrive this way from factory? I know they need to test fire firearms before they ship them, but dont they clean after the test fire?
Added all pictures here:












Added all pictures here:












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