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If you post again with the brand and model of the shotgun we can help better because yes this will fit ar15 style 12 gauges but some ar15 style 12 gauges don't take this type of magazine. So all depends on the brand and make your talking about. Hope this helps.

Stella, yes this will fit the vast majority of AR-12 Shotguns. So will the 20rd Drum : https://www.budsgunshop.com/product_info.php/products_id/111608

Stella, yes this will fir most AR style shotguns. Have a great day!