I believe it is legal as long as the resulting firearm has a barrel at least 16" and OAL of 25" which the rifle under discussion is. Note that Ruger makes a 10-22 Charger pistol (well after the 10-22 rifle was introduced) and Contender actions I believe came with all lengths of barrels. My further understanding is that once a rifle is issued as a rifle the receiver remains a rifle and once a pistol is issued the receiver remains a pistol. Thus you can't modify a rifle into a pistol (convert a 10-22 rifle into a pistol), but you should be able to put a long barrel on a 10-22 Charger, for example (no restrictions on pistol barrel lengths). That I suspect is what caused Al Georg problems - he converted a rifle into a pistol, but that would have actually been classified as a short barreled rifle. No one ever said the regulations have to make sense.
Last edited by cpa; 11/19/14 10:41 AM.