Best left to a gunsmith
The magazine tube holds 15 rounds.
I would look at numrich gun parts corp.They can be found on the net.
Leave this to a gunsmith
There is a magazine tube under the barrel. Turn the end of it and the spring assembly will come out. Load the magazine, put the spring assembly back in and your ready to fire. To fire you take off the safety pull back the knob on the chamber slide to cock the rifle and pull the trigger.
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.
By 'buffer spring' I assume you mean the recoil spring that drives the bolt forward. Remove the inner magazine tube. Using a nylon punch, drive out the crosspin that retains the trigger guard and move the rear of the triggerguard downward and rearward to remove the assembly. With the gun upside down, pull the bolt rearward enough to tip it up at the front which will release the operating handle. Remove the bolt upward, and you will have also removed the old recoil spring. Reassemble in reverse order.
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.
The Winchester model 290 was introduced between 1963-1965 and was last made in 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 was made between 1965-1973.
your Winchester model 290 was apart of the 200 model series which included the model250 270 290 255 275.the model 290 were made between 1963-1976.the total production of all models were 1,600,000.With your serial number I would guess around 1970.