I have a 1898 Benecia carbine conversion. I have had it for many years. When I bought it someone had drilled two holes the receiver for a receiver sight (Lyman, Redfield, etc.) >:(. Well, he drilled over a number for the serial number...almost two. The sight had then been removed and two thread plugs were installed. Spoo, now the serial number is not legit able... Is there going to be a problem for me? This modification is Very old, before serial numbers were really an issue. :( I have NO desire to get rid of this carbine, it is about 98 percent condition with a mint rifling bore. Help please. John