Where could I find a good, black 18" barrel for a Remington 870 at a good price? I'm going to add an adjustable stock with pistol grip, and the short barrel for home defense. I'll add a light later, and maybe a laser. I want to pump once, and hopefully the intruder will flee. If not, and I have to shoot, I don't want to miss, and I want the dude DEAD. ("oo" buck, 3 1/2 inch super-mag, or 3", if that is all the 18" barrel will take)