If you like and want the gun, make an offer to the seller, but be sure and get a 3 day inspection understanding and send it back if you find issues with it or don't like it.
Any 21 will continue to grow in value (unlike the above mentioned Sears Special) as long as they are taken care of. This one would be a waterfowl gun for sure that you wouldn't have to baby and probably give years of service. Any mechanical issues that come up in the future are easily fixed by Galazan's.
One note of warning.....if you acquire a 21 and like it, it will not be your last; it's like eating potato chips.
(a couple more have been added since this pic)