Make homemade "guns", trade them in for cash, buy real guns.

https://www.lawenforcementtoday.com/police-man-sells-junk-guns-to-buy-back-program-buys-new-gun-with-cash/

According to an AGG report, William Stewart Boyd traded his father’s old .38 caliber Smith & Wesson snub nose for less than $100 in a gun buyback in 2004. It was supposed to be destroyed, but somehow the same handgun with serial number J515268 was found next to a dead body involved in a police shooting eight years later.

Imagine trusting the same organization that has no qualms about planting evidence against you to dispose of a weapon properly.

* Edit: For today's brief web reading, may I humbly suggest Rampart.

I’m surprised you can still purchase guns in Canada.