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.
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.
your Winchester model 290 in good condition should be in the range of 200-275 dollars.
Try Numrich gun parts corp.They may be found on the web.
The Winchester model 290 was introduced between 1963-1965 and was last made in 1976.
Your Winchester model 290 ranges in price from 90-200 dollars based on overall condition.
Proofhouse.com has Winchester sn tables.
Leave this to a gunsmith
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.
Winchester did not keep records of the production of the 200 series of rifles.This includes the model 250,270,290,255,and the model 275.These rifles were introduced from 1963-1965.The model 290 was discontinued in the year 1976.