This is a M1/M2 Carbine front sight protective block. It is designed to eliminate barrel roll and sight ear damage while driving out pin. This particular model is designed for the larger stamped sights but can also be used with the milled ones (though loose fitting).
Simply slide block over front sight,visually inspect hole alignment and pin position, then use a 1/8" pin punch to drive out pin. It can also aid in installation.
I have a larger block in another listing that is made for stamped on one end and milled on the other.
Feel free to ask questions !
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