Monster mark slugs for your HDR50

Monster mark slugs for your HDR50. Including a free ball loader in the downloads Light weight. Medium weight and Heavy weight - 3 types ! Cal .50" x 13mm - 3 .stl files / 3 types: - one .stl for inserting 6.25mm steel ball - one .stl for inserting 8mm steel ball - one .stl for no need for inserting steel ball Press a steel ball into the slug with a blunt object, no glue needed! Or just print the other file with ball material allready in it! Low cost, accurate, fast rotating, self