The TRG-22 is a TRG-21 modified to meet the requirements of the Finish military. Importation of the TRG-22 began in 2000 and this rifle is still being imported.
I would get the Sako scope mount and I would get the Sako muzzle brake for this rifle. You might as well price the quick attach/detach sling swivels, sling and bipod while you are calling. (On a quick side note, if you get the MB, remove and clean after each range session. This brake is very effective but will weld on if not removed and cleaned frequently.)
Assuming no accessories, including no box, and assuming about 98% condition, I would say between $1800 - $1900.
This fine rifle is well worth assembling all the accessories (MB, scope mount, etc.,) if you plan to keep for a while.
Now don't forget, you're gonna want a good scope.