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