That's a little broad. "Firearms" - Pump/bolt shotguns can be down to 18". As for bolt action, or any non semi-automatic rifle, centerfire, I may be incorrect, but I was under the impression one could take it down to 18". Semi, yes 18.5. - I didn't catch the part in the video, that these modded SKS were 'Restricted'.
"no, he meant 18" cos he said its restricted but why would some not cut it half inch longer?"
Ahh, k. I didn't catch that part. Makes no sense why not make it NR.