I nearly did a carbine project but sold the gun instead.
I have a TG serial (.22) barrel that I had reduced to 14.5 inches so 4 inches removed (therefore no front sight anymore of course).
I had the tip crowned and also threaded for a screw on silencer.
Being a TG it would be the Mk 4/5 articulated cocking link type (it was a Super I was doing though so Mk3). Not sure if that barrel would work with an earlier one piece link gun?
It has a Parker Hale silencer of unknown condition/quality and as it's almost 7 inches long, I realised I'd lost my carbine looking option, being 3 inches longer overall when screwed on.
The barrel has unsightly threads showing if the silencer isn't fitted so I lost interest and didn't go ahead.
Although it would ruin the originality of my Meteor Cadet I could try it on that but then it would need a scope and the thing about the Cadet version is the rear peep sight.
More likely I'll never use it so if the barrel interests you pm me.
Steve
I've had Good deals & great info from many in this forum.