I recently bought a Winchester 120 at a gun show, it was a great deal and the gun was in great condition. I was looking for a cheap project 12 ga. and I had figured I had found once, after realizing that a 120 is compatible with Winchester 1300 after market parts thanks to the wonderful Firingline community.However, because I had never seen a 120 before it struck me as being slightly rare. Is it rare? Would it be a travesty to modify such a gun?