It's a Tactical Solutions barrel,I dont even know if they are in business anymore, I got it about 20 years ago in a kit with trigger parts stuff and a plastic thumbhole stock. The stock was wayy heavier than the factory one so the reason for the change. The barrel is a hollow aluminum tube with a stainless steel liner barrel.
I shimmed the action so the front of the forend drags the dollar bill under the barrel.
I haven't shot it since I finished it last night but am gonna sight it in today.
With the old stock and Aguila subsonic 38grn it would shoot 1 ragged hole at 40 yards if there was no wind most times, the most accurate rifle Ive ever had.
I wanted it light for a squirrel dogging rifle, lotsa walking.