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Posted By: crs Beretta gas pressure relief grooves - 10/27/18 03:19 AM
How effective would these gas channels be on this 12 gauge action if a primer is punctured?
Not very much at all, IMO. In the case of a punctured primer the indentation of the striker is the source of the leak and the gas is going back through the striker hole in the breech face into the action. Those channels might bleed off gas in the case of leakage around the outside of the primer.

SRH
A lot of Italian guns have those:



These are cut into a 20 gauge P&G.

I’m guessing Stan is on the right track, mostly because I have so many guns that don’t have them, and I’ve walked away from a punctured primer or three without injury.

Best,
Ted
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