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The "Thing" is called a poly-choke. It is a manually adjusted choke. I think they are still in business. And yes I have shot many deer with slugs fired from my Model 20. If you could give a more detailed discription, or perhaps a photo it would be helpful. It may possibly be the Power-Pac choke. That "Thing" is probably a Compensator , and a Varible Choke, or just one of either.

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Q: What is the cylinder type thing with vent holes at the end of the model 20 12 gauge?
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