Chamber support?

tog

New member
looking into getting a 357sig in the near future, i have a ? about chamber support.
can someone show me with a picture the difference between fully supported and non?
like i look at the round in my g21 and the rim and the upward slope into the full size of the round is visible, is this not as supported as others?
this is becoming an issue for me and i want to clear it up just want to see an example of a fully supported barrel
is the g31 fully supported?
 
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