^ hical sells a lot of individual 10/22 parts. All their shipping costs are $10.
Firearm Accessories - 10-22 Rifle - High Caliber Services Corp
Reliable has the Rock Island barreled action for sale, though I think they have proprietary barrels.
Reliable Gun Vancouver, 3227 Fraser Street, Vancouver BC, Canada. Armscor Rock Island Armory 10/22 Semi-Auto Barrelled Rifle Action - 22 LR, 18.5", Contoured Ordnance Steel, 1:6", Parkerized, No Stock (Barrelled Action Only), 10rds, Bead Ramp w/Fibre
$300 for just a trigger set is too much in my eyes. I'd buy another K31 first.
And it's good you're off the meds - they serve their purpose but then themselves can become the issue