>>64077532
Have you never sighted and fired a shotgun? You make it sound like having bead sights means your cone of fire is like 50 feet wide at 10 yards. Shot accountability is important but you wont be grossly sending pellets in every direction. 10 to 15 yards is about fist to paper plate size pellet group. Over penetration risk would be the same for an AR in 556 or 300blk.
And whats all this about 5 vs 7 round tube mag? How does that make a difference? The only thing it does is limit your barrel choice, but you can fix that in 10 minutes with some heat and a new tube mag of your chosen capacity.