I have 3 that range from pump to semi auto and had the same desire a while back; a gun anyone could throw on their shoulder and be effective. I ended up on a Mossberg 500E in 410. Re-barreled with 18.5" and threw a front sight on it. Use Hornady self-defense rounds that have 41 cal slug in front and 2 balls behind it. It is light, almost no recoil, and the round itself is a reckoning. At 25 yards it is dead on. A 10 year old child could manage it. It took a bit to pull together the gun and barrel. I was surprised how hard it was to find to find the 410 shotgun. Good luck.