Does anyone know who makes a dovetail barrel adaptor to fit the HFT500 please?

We would like to fit diopter sights to the HFT500 for some informal target work at 10 metres and need to find a simple slide-on barrel adaptor that has dovetail rails on it to accept a foresight tunnel.

I remember seeing one some time back that was a simple exchange for the standard barrel weight - just loosen the retaining grub screw and slide on the replacement barrel adaptor.

Fitting the diopter sight is no problem and with a suitable barrel adaptor its should be a simple job to swap between a 10 meter target rifle and a scoped FT target rifle making a very useful dual purpose air rifle.