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Lee, I've heard similar complaints using mka 1919 mags in AR12 style shotguns. Alot of times they will loosen up with use. You could also try finding the spots it's sticking and sand it down a little or just insert and remove the magazine repeatedly until it loosens. The Hatsan DF-12 shotgun can accept AR12 magazines and mka 1919 magazines. Here's a link to a AR12 style magazine I'd recommend trying..................... https://www.budsgunshop.com/product_info.php/products_id/127318/sds+imports+t10rdm+replacement+magazine+12+gauge+sds+imports+10rd+black+detachable ................... sorry you're having trouble but hope this helps some.