Take it to a competent gunsmith.
By a good gunsmith.
Use a punch and tap it across the barrel. Its a dove tail joint.
Leave this to a gunsmith
Best left to a gunsmith.
Brownells carries just about any gunsmithing tool there is.
The Winchester model 290 belongs to the Winchester 200 series of rifles that were introduced between 1963-1965.The model 290 was discontinued in 1976.
your Winchester model 290 was made as a group of models including the 250,270,255,275 and the 290.these were made from 1963-1976,with the model 290 being the last model made.
your Winchester model 290 was made between 1965-1973.
the best I can do is say that your Winchester model 290 was made between 1963-1976.
remove the buttplate screws, and the buttplate. In the large round hole in the stock is the stock bolt. That is unscrewed to remove the stock from the rifle.
your Winchester model 290 in good condition should be in the range of 200-275 dollars.