I am not sure they would work in a pump. This would be a question for the manufacture of the product due to rim cuts, chamber sizes and even choke would come into play and all those other veriables. Interesting concept. I think with the low cost of so many single barrel shotguns these days I would personally not even use such a device as I could most likely simply buy a single shot for near the same price such a product would cost if there was one.
J.D. McGuire, Owner
AI&P Tactical, LLC
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Remington LE Armorer
Mossberg LE Armorer