The gun was submitted for inspection prior to classification and approval. That video is a SFSS demonstration of the ease with which the gun could be converted to full auto. Classification was prohibited.
Is it legal to do that ?
From Armalitics .ca
Summary
Firearm Reference Number (FRN): 129614
Valid As Of Date: 2020-09-14
Manufacturer: ########
Level: Manufacturer Specifications and Commercial Customization
Country of Manufacturer: CANADA
Serial Numbering: See Note
Calibre, Shots and Barrel Length
FRN
Calibre
Shots
Barrel (mm)
Class
Legal Authority
Barrel Type Code
129614 - 1
9MM LUGER
5
200
Restricted
CC 84(1) "restricted firearm" para. (b)
129614 - 2
9MM LUGER
5
475
Non-Restricted
CC 2 "firearm"
Notes
Make
"########" was observed marked on the upper surface of the magazine housing.
Model
"STEN MK II" was observed marked on the upper surface of the magazine housing.
"CANADA" was observed marked on the magazine housing.
introduced in 2009.
"STEN MARK 2" submachine gun design was distinguished by its all-metal welded construction and by a short barrel that could be replaced by pulling out a lockingratchet and unscrewing the barrel nut (attached to the ventilated barrel shroud); and the magazine housing could be rotated about the receiver axis to reduce the width of the firearm when carried.
######## Sten Mk II closely resembles a Sten MARK 2 submachine gun and is capable of accepting parts from an original full-automatic Sten gun.
design features observed: refurbished barrel, barrel shroud and barrel nut; newly manufactured magazine housing assembly; newly manufactured tube assembly withthe sear cut-out width reduced; re-manufactured breech block/bolt assembly with non-removable cocking handle and rear spigot extension; access holes between the tube assembly and trigger group casing are welded closed; selector is welded to the trigger group casing in the fire position; trigger mechanism cover drain hole is weldedclosed and assembled with no removable hardware; refurbished removable butt assembly; fixed sights; blued finish.
Manufacturer
"########" was observed marked on the upper surface of the magazine housing.
Action
advanced primer ignition, blowback operated.
Shots
detachable box magazine.
accepts all Sten submachine gun magazines.
Serial Number
serial number was observed marked on the magazine housing upper surface.
serial number rationalization is unknown.
observed serial number consisted of two letters "SS" prefix and five numbers.
observed serial number consisted of two letters "SS" prefix and seven numbers and a two letter "CA" suffix.
serial number was marked with a tool similar to an electric pencil and is very shallow.