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This adapter gives your 20 Gauge single or double shot break open shotgun the ability to fire a 40 S&Wbullet (standard 40 Smith and Wesson caliber). It will easily fit into your break open shotgun barrel and accept any 40 S&Wammunition.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.