I just purchased a 2016 NIB Colt AR-15A4 because I wanted one that had a roll marked lower and C stamps. I don’t like the newer cheap looking laser engraved lowers and I don’t care for QR stamps or cage codes either. I initially thought the rifle was going to be one that came with just an A2 FSB because there was no F mark on the left side in the pics. Upon further inspection of all the pics, there is an F on the right side of the FSB. It appears to be a genuine stamp and not a forging. Here are the pics for review and opinion. I never seen an F on the right and I’ve owned or have been issues plenty of F marked Colt’s over the years.
I pulled this photo off of a discussion about CQB barrels on this website, from about seven years ago. The photo was comparing a 10.5" barrel with a Colt 10.3 (the bottom one).
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