I have been doing research and can't get a straight answer. I read with a stamp you can not modify a semi-auto to full auto unless you're a class 3 dealer / gunsmith. If i took a registered semi-auto to a class 3 with appropriate paperwork can they "modify" my weapon to be full-auto? Or if you're class 3 you can just do it for your own personal use? I don't get it. Or am i totally wrong all together and need to buy a pre-ban FA rifle... Any info shedding light would be appreciated.