I know I shouldn't........I won't........arrggghhhhh.........

How about a nice M21 or M12 Heavy Duck?

M21s: the usual double-gun eval, though check out Mike's page. M12s: bore for pitting/choke alteration/pre-choke bulge from steel shot, take-down adjustment for sense of wear, function test for shell plate/extractor/ejector issues. A broken M12 firing pin will oftentimes still work reliably. Frame and barrel (barrel stamped 3") extension SNs should match. LOP on these models is 13 5/8" to end of rubber pad, IIRC.

Auctionarms, Gunsamerica, Galazans (might have the 21).

Sam