It is stretching things a bit, but technically I suppose it is a missile launcher and pressure bearing so is a Section 5 item.
A comparison is the cup discharger for a SMLE which the Home Office consider Section 5.
Regards
TonyE[/QUOTE
Tony . The cup discharger for the SMLE has been deemed NOT to be covered by Section 5 in several recent court cases , including one that involved a member of this forum . After being confiscated , it was eventually returned with a clean bill of health in totally original & unmodified form . However , I do realise that it's a difficult area.......