Why would they use potato guns for that? They have real guns they straw purchase. Less work to get a girlfriend or even a neighbor to buy a gun, give it to you, and tell the police the gun was stolen. Heck, I'm fairly certain more people are shot with a bow and arrow than a potato gun, but the potential is still there, as with black powder muskets and rifles. The simple fact is that, no, 100% of guns aren't made in factories. Most are, and the ones that are not have zero accountability. It's quite legal. Weapons made from scratch or from kits are perfectly legal to make and own, with no Federal requirement to register or report. California may be the only state in the US that requires weapons like this to be registered, but only after they are made, and so, again, no background check or anything up front, and of course, catching them after they are made is pretty much impossible. The same law applies to 3D printed guns. They're perfectly legal to make and own, you simply can't sell them. The most common weapons made from partially-completed receivers are the AR-15 rifle platform, but there are also metal blocks for the 1911 handgun and a few other weapons. The NRA began as a shooting sports and gun safety organization. It sponsors the Boy Scouts of America, 4-H, and a lot of traditional American groups. It also sponsors the "Eddie Eagle" gun safety program aimed to help children stay away from firearms. The NRA has a wing called the Institute of Legislative Action (the NRA-ILA) that is the lobbying section of the NRA. It's the section of the NRA that has all the lawyers, and people involved politics. It's this section that shifted the NRA towards becoming a gun rights group. And even then, there are growing groups that think the NRA is WEAK on gun rights. The National Association for Gun Rights (NAGR) is a "No Compromise" group on Gun Rights that spends more on lobbying than the NRA-ILA.