I’m surprised at the number of my friends who do not know about mini shells. Using them with OPSol’s adapter gives new life and use to that 12 gauge you have in your weapon locker. It makes the gun fun to shoot again - offers practical and enjoyable opportunities to take the shotgun to the field or use in the protection of your home. The adapter is easy to use and never fails to cycle a round in my Mossberg 500. Best gift ever for anyone with a shotgun - so get several. I love this company - and the fact that they’re made here in the USA and by a veteran owned company make it the trifecta!