Well I got an old Sauer 12 Ga shotty for $ 260 to maker some thing out of ( Rifle or Slug Shooter ) & I glued some sights on with two pot glue for testing ! here are the very first 4 shots at 20 yards with some Winchester slugs I had laying around , not bad for first try & sights glued on by eye , I pulled the last shot to !

Shows promise for round balls later ?