What is the value of a double barrel J.stevens shotgun?

In general they weren't high end guns. They tended to be blue collar, weekend warrior functional guns. Without out condition and more detail it's VERY hard to say...unfired in the box all the way to rusted shut add or delete from the basic price. The best way to find out is to look up the blue blook on the gun by condition or go to GunsAmerica.com or GunBroker.com and see if ysomeone is selling what you have. If it sells for their asking price, then that is pretty close to the true value.