So, I have a question. Since this device takes a small arms cartridge, how is it viewed in the hands of civilian collectors? Is it classified as a firearm? For instance, the lanyard firing mechanism in a U.S. 60mm Mortar is considered a firearm.
I would go for Section 1. Based on the fact that a Miniflare Projector Mark 1 (the metal version with screw in aluminium cartridges) is classed as Section 1. This is due to a bizarre piece of case law that deemed the cartridge case to be a barrel. Notwithstanding that decision, it (the Miniflare Mk1) would fall into the readily converted category.
Frustrating to see some of the same errors of the original guidance have been 'cut and pasted' into the new edition, for example para 3.20
TimG