For those who don't believe in ghosts

[friendly_iconoclast]

1. I don't believe requiring serial numbers will impact illegal use very much, if at all

Criminals will move to entirely homemade guns, as see:

https://www.google.com/search?q=homemade+submachine+guns&source=lmns&bih=713&biw=1536&client=firefox-b-1-d&hl=en-US&ved=2ahUKEwiRyImngLvmAhUDWt8KHZk4ARsQ_AUoAHoECAEQAA

https://www.abc.net.au/news/2016-11-23/queensland-police-find-sophisticated-gun-manufacting-workshop/8051244

Queensland Police have charged five people after finding homemade machine guns, a weapons factory and drug labs during raids on the Gold Coast.

Police and Australian Border Force officers searched four homes and two businesses last Friday.

At an industrial shed in Nerang, police found four machine guns, a commercial pill press, weapons manufacturing equipment, silencers, a 3D printer and drugs.

Detective Superintendent Jon Wacker said he believed it was the first time police had seen machine gun manufacturing in Queensland...

https://www.ctvnews.ca/canada/homemade-submachine-guns-seized-near-edmonton-1.3558129

Homemade submachine guns seized near Edmonton

Jackie Dunham
CTVNews.ca Published Wednesday, August 23, 2017 12:15PM EDT Last Updated Wednesday, August 23, 2017 1:35PM EDT

Alberta law enforcement officials have seized four prohibited firearms, including two homemade MAC-11 submachine guns, and arrested two suspects in Edmonton following an eight-month investigation.

The guns were allegedly manufactured at a “professional grade” machinist shop, located just west of Edmonton, according to a press release by Alberta Law Enforcement Response Teams (ALERT) on Wednesday. The owner of the shop was not aware of the guns, the release said.

ALERT Edmonton’s Guns and Gangs unit, with the help of Edmonton police and RCMP, confiscated a Beretta handgun equipped with a suppressor, a modified Suomi submachine gun with two oversized magazines and two homemade MAC-11 submachine guns with suppressors and oversized magazines.

Investigators are still looking into how many MAC-11 submachine guns were produced. They believe some of the weapons have already made their way to the criminal market.

...while legal gun owners will buy serialized kits, to save money and/or just to make something themselves-
like the narrator found out, making stuff is fun.