Sterling Lee Enfield 7.62NATO Conversion

[Buccaneer]

I would have to agree Geoff, if it goes on your FAC then its "officially" a firearm and subject to the same restrictions as everything else. In this case Sec5 unfortunately.

How about cutting away the chamber area, the bolt head etc (SKN ish), in order to render it totally inert? Then take it off your ticket...

As I understand the current deact rules the barrel, what's left of it would need to be slotted and a rod insterted up to the breech face and welded, the action would need to be slotted in line with the barrel slot. The bolt would need to ground off at the face and have the firing pin hole welded and the one of the lugs would need to be removed. Next the magazine slot would need to have a pin fitted and welded in place to prevent a magazine containing any rounds from being inserted, the empty magazine can have a slot cut in it to fit around the pin if required.
If a round can be loaded and fired once a trigger is reattached then you have a section 5 handgun as far as the current laws are concerned, it does not appear to be deactivated in any way that the law would recognise, at the very least I would recommend getting the barrel slotted and filled the rest would then be down to interpretation.
To be able to take it off you section 1 ticket it would need to go to the proof house and be issued with a current deact certificate, so all of the work previously described would need to be done.