No argument there. For the one box of shells in pheasant season shooter, the extra longevity of the M21 is probably not a factor-but they are rugged- I have never needed to adjust the set screw to take up any "looseness" in the action, and from 1980 to about 1995, when we had great area pheasant and grouse populations, I shot Dad's M21 almost exclusively with my Labs- both here in MI and in MT as well-they are to boxlock doubles what the great M12 pumpgun is to repeaters- Vade Mecum--

"The field is the touchstone of the man"..