Buy it...
While not the handmade jewel the Model 21 is, it's a sound, serviceable SXS with a good rep. On the heavy side for upland work, but not by much. That English grip will help that last.
Every 10,000 rounds or so, take it to a smith for an internal cleaning and checkup.
If it was a grouse gun, it's probably choked IC and Mod, great for most bird hunting.
It sounds like a keeper...
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