The "F" should be in the forging. It is not marked later when machining.
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I understand that. The point is that there are some that are not marked that still meet the spec (as well as the reverse, actually).
sometimes this chart is a curse. People obsess about color of inserts and markings on bases rather than whether or not they have proper extraction and correct front sight height.
Well I bought a brand new upper from a guy that lost his job. He bought it new and I got the original packageing, and it still had the check off tag attached to the FSB.... It came as a whole unit, from a dealer in Tennesee.
What do you think? There is a mark on the FSB that could be an F but it is a little rough. I am more concerned with the BCG. The gun does have a top rail a LMT rear tact sight. Are the BCG's marked in any way??
Hey Rob_s,
Why aren't the ADS, Knight SR-15 and Magpul ACR rifles included on the chart?
Rob anyway to enlarge to chart? Witht the new format it would make it easier to read.
Thanks
NO.
A2 front sight base forgings are all the same.
It's how they are MACHINED that makes them different.
Bases destined to be installed on flattop carbines will often be machined 0.040" higher and be stamped "F" to designate as such.
There are NOT different forgings for the two different heights.