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12/17/2011 3:19:27 PM EDT
i have an A2 upper i am looking to put a mid length barrel on. i want to use the standard front sight post. what is the difference between f marked and non f marked front sight posts? when buying the barrel what kind do i need to make sure it has?
12/17/2011 4:17:11 PM EDT
[#1]
F marked FSB's are for flat top receivers and are slightly taller to match the rear sights on a flat top without having to use a taller front sight post....

12/17/2011 4:19:38 PM EDT
[#2]
thank you. i will make sure i get a non f marked front sight then..
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