Rudras
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Just got my QC10 BCG in the mail. Slapped it in my upper and noticed some scratching noises. Pulled the BCG out to inspect and noted that the cotter pin protruding somewhat outside the bcg body. There were scratch marks on the top of the pin. Then upon even closer inspection. Noticed the "gas key" was not staked. Not sure if this slipped through quality control, Should i contact QC10? Thanks for your input!