Stock Pinned Front Sight Post .750"

Looking to buy a used pinned front sight post for a Colt 6920.

Right now I have a carbine with a 7" rail. I am looking at putting on a longer rail and want a front sight I can shave down so it will install under the rail but do not want to cut the original sight up in case I want to put it back.

I looked at buying a new one but they do not come drilled.