I find it funny that they go ballistic - excuse the pun - over the printed gun, yet wouldn't bring in checks for crazy people / criminals when buying guns. As you say - protecting the arms industries interests.
Also funny are those who think that their right to bear arms will help them fight against the government should they get out of line - maybe back in the day of muskets, but all the small arms in the world won't do much against tanks/drones/jets/attack helicompters/missiles etc, should the government want to put down any group that gets uppity - Waco being an example