Helston Gunsmiths has 4 really interesting pieces:

S3315 plastic fixed stock, no studs, wood forend grip



S4212 Single Shot (previously reported)



LA 2 Semi-Automatic 9mm Carbine Mk6 - long front tube, corresponding with the semi (non suppressed) [Mk9?] sold by Peter Wilke from OGT in Canadaicon
LA 3 Semi-Automatic 9mm Carbine Mk6 - long front tube, corresponding with the semi (non suppressed) Mk9 sold by Peter Wilke in Canada