New Benelli Nova Tactical-Tacstar Extention

Purchased my new Benelli Nova Tactical the other day and wanted to add to it so I ordered a Tacstar +2 extended mag for it through tacticalshotgunner.com. I usually do my homework when buying items like this but purchased this on impulse. Noticed some reviews on the Cabelas site and was surprised to see quite a few bad ones on the Tacstar. Mostly because of the ends coming off and springs flying during shooting. Did I make a mistake with this and are there any alternate extentions for the Nova Tactical. Thanks.