Is this abnormal gas leakage or just normal gas "blow by?" I ask because I haven't seen any other AR's do this and want to make sure this isn't going to lead to any future problems. This is from about 500-600 rounds fired. This is a BCM BFH 16" upper and has functioned flawlessly. BCM has been great and offered to inspect it and check it out but I don't want to send it in if it's just cosmetic. If this is just a cosmetic issue and won't affect function then I could care less, I only care about it functioning which it has done 100%. What do you think?
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