![these are shotgun adapters aka chamber reducers aka shotgun inserts and called by a few other names. they allow you to fire lower gauge (caliber) shotgun shells out of a larger bore these are shotgun adapters aka chamber reducers aka shotgun inserts and called by a few other names. they allow you to fire lower gauge (caliber) shotgun shells out of a larger bore](https://preview.redd.it/these-are-shotgun-adapters-aka-chamber-reducers-aka-shotgun-v0-m5ubxxk0owxa1.jpg?width=1536&format=pjpg&auto=webp&s=ee6e8bbfadbbf2ebeaf9ac4c8d676502580c6031)
these are shotgun adapters aka chamber reducers aka shotgun inserts and called by a few other names. they allow you to fire lower gauge (caliber) shotgun shells out of a larger bore
![Amazon.co.jp: Handle Post Conversion Column for Bicycles, Normal Light Vehicles, Thread Stem, Caliber Adapter (Silver) : Sports & Outdoors Amazon.co.jp: Handle Post Conversion Column for Bicycles, Normal Light Vehicles, Thread Stem, Caliber Adapter (Silver) : Sports & Outdoors](https://m.media-amazon.com/images/I/51NxdFYg3yL._AC_UF1000,1000_QL80_.jpg)
Amazon.co.jp: Handle Post Conversion Column for Bicycles, Normal Light Vehicles, Thread Stem, Caliber Adapter (Silver) : Sports & Outdoors
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