rollmark

Can anyone tell me where the "Restricted, Law Enforcement Only" rollmark is located on a Colt LE6920 rifle ?

A friend of mine will be having a special anniversary coming up in a few years at work. I wanted to do a heavily customized pistol (1911 preferred) with his hire date and other important info. If I buy a pistol off the shelf, how much work would it take to remove the factory rollmarks on the...