New take off Colt .750 FSP with taper pins, end cap, and barrel nut. Not F marked but it is for flat top upper.  Front sight post includes front sight pin, detent, and spring.

MFG Colt
MODEL FSP .750 Nut/End Cap/Pins/Swivel
TITLE Colt Front Sight Post .750 Barrel Nut/End Cap/Taper Pins/Sling Swivel

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