Absolutely! I know many PDs who would sell their MP5s for 20k a piece and update for a fraction of the cost. Thompsons, M14s, MP5s, M16s... you name it.
Obviously in the case of my customer it's semi but if it wasn't, it's hard to believe that piece of history ends up getting trashed...
I'm still confused about the "dealer sample" is it stamped that or is there paperwork?