doesnt include shotguns. from bill blairs twitter,
https://pbs.twimg.com/media/EXXp9ZcU0AArAOz?format=jpg&name=large
"the regulation introduced on may 1st does not prohibit 10 and 12 gauge shotguns. the regulation for 10 and 12 gauge shotguns is based on their standard size both under 20mm.
in accordance with acceptable firearms industry standards, the definition for bore diameter explicitly states that is after the chamber, but before the choke in shotguns. therefore, if the measurement is taken at any other location, it is not a factor that is being considered under amendment 95 of regulations"
seems like backtracking and using vague generalizations like "in accordance with acceptable firearms industry standards".
Well, why don't you do an extract of that standard and post it here, we want to see it. Right now, several lawyers specializing in gun laws are telling us these shotguns are prohibs, and any one ignoring it is doing it at his/hers own peril.