I would go with the standard rifle with the good fixed sights and leave it at that. With five or ten round mags, the weapon is long and slim and easier to conceal under a long coat or rolled up in something (we're talking SHTF, of course). I would keep it loaded with .223 soft or hollow points-a friendlier choice in a populated area. These are not tack driving rifles, their role is more like an M1 Carbine, a light rifle that's there when you need it.