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Amazon.com : BERETTA OptimaChoke High Performance 20mm Extended 12Ga Full Nickel Plated Choke Tube : Sports & Outdoors
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Guide to Shotgun Choke Tubes | Bass Pro Shops
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Shotgun Chokes Explained - a Guide to Markings, Sizes & Patterns | The Yorkshire Gent
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What are the measurements of a full shotgun choke? - Quora
A beginner's guide to shotgun chokes - by John Robinson - SSAA
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doublegunshop.com Shotgun Chokes for 12 bore or 12 gauge guns.
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Invector Tube Selection - Browning A 500 Semi Automatic Shotgun
