All this is understood. The intent of my post was to warn people to be very careful when converting pistol to rifle. Once you put the butt stock on it, better have a 16" barrel or longer and be 26" long overall. Most AR pistol kits include barrels way under legal rifle length.BretJ FYI
http://www.kwikrnu.com/BATFE opinio...11-4 pistol to rifle to pistol conversion.pdf
Question 5 with answer below in ATF response.
http://www.kwikrnu.com/BATFE opinio...and response 9-11-11 12-23-11 buffer tube.pdf
WR