Hi folks, noticed some wear in my newish BCM upper, looking for some input here. Specs are a 12.5 inch BCM upper, BCM BCG, and running an H2 buffer. Have only about 350ish rounds through (223 55 grn ball), about 50% suppressed.(AAC 762SD for about the first hundred, other have been with my M4 2000) cleaning today and noticed a rough gouge where the cam pin rotates in the upper...Running my finger on it is almost sharp..Cam pin has a "line" in can feel with my finger , right along where the finish has worn...Whats gives here? I took a look at my Colt 6920 which I have thousands of rounds through, wear in the same spot but not nearly as "rough" feeling as the SBR upper. (The Colt has been run unsuppressed) Thoughts?
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