2. For Class 2 manufacturers to place the holes for factory select-fire components into a previously semi-automatic-only weapon. They guide the drill and provide precise hole placement so a valuable receiver is not destroyed.

Under Federal law, anyone may purchase these legally, but you must have a Class 2 license to legally use them. Additionally, your state and local laws may prohibit purchase or possession, so check before you buy, as with everything I sell. Detailed instructions accompany each fixture.