I let a friend use a rifle a while back and just told him to clean it up after he was done. I think he used a stiff bore brush on the inside of the BCG as there are small scratches inside. It doesn't seem to be through the finish and my fingernail doesn't actually catch on any as I slide it down the inside wall, but I can feel the grooves. I have shot it since noticing the scratches and had no issues but I am concerned about future wear on the BCG and if I should expect any malfunctions sooner than later. I don't know how far into the BCG the scratches go, possibly all the way past the firing pin. Just wanted other opinions and wanted to hear if anyone had any similar experiences. Rifle is a DDM4 PDW if that makes any difference.
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