No....Worst case scenario something happens to the scope, take a day to get new one and sighted in. Something happens to break the stock there is a broken bone on me as well.
your weapon system should be failproof and if you bring a spare you don't have enough faith in it, or it isn't built to be sturdy enough for the field. Sometimes you have to make your plan B a lot less desirable so you don't give up on your plan A.....