Since it’s at a gun show and the 99 is still sitting there, it’s not worth the price whatever he is asking.

Original high condition 99s never sit long. I have been collecting them for 25 years. There are exceptions, but tampered guns are not nearly as desirable.

"...aspire to live quietly, and to mind your own affairs, and to work with your hands, as we instructed you, so that you may walk properly before outsiders and be dependent on no one." - Paul to the church in Thessalonica.