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What Is An F Marked Front Sight? [Solved]
As Patrick Sweeney points out in his book Gunsmithing The AR-15, Colt could have modified the carry handle for an easy fix, but instead they chose to alter the height of the front sight housing. These new front sights were stamped with a letter “F” to differentiate them from the older models.16 Nov 2012
AR-15 F Marked Front Sight Block (FSB): Does It Matter?
Does the "
Mixing/Matching F Marked and Standard Front Sight Bases and Carry Handles
My mixed up builds still shoot great.
AR-15 Front Sight Base Install Option #realraysgarage
In this video I show a option to installing a the AR-15
