I just ordered a upper to play with in 7.62x39 I ordered the 18" so I am good this time but I am wondering what I would have to do if I wanted one that was shorter? The lower I am using is not registered as a pistol its one I purchased when they did the last buy here (Pretty!). It said I was responsible for having the proper paperwork. What is the proper paperwork? If I had a pistol length lower it would be a pistol or a carbine depending one which upper I would have on it at any time.
Thanks