If I start using my RIA USA 12 gauge for home defense it won't be with the 19 round mags. It's a 6.6 pound gun, and those mags are heavy when fully loaded, big and awkward,, more prone to failure, and strictly for having fun with. The other size mags seem better and the balance point of the gun seems to be right in front of the mag well, loaded with any mag or empty, and it doesn't shift rearward as the ammo is used up, like with under barrel tube magazines. The Kalashnikov USA KHAOS should be the same. The CG moves up closer to your hands as you use up your ammo, but not from your left hand to your right, or vice versa. The gas system on my gun is a lot like my Remington Sportsman 12 Auto, and that gun's super dependable. The only fly in the ointment is the questionable magazines for any of these box fed shotguns and firearms.