[m21sniper]

BTW, i'd reccomend you put a tritium bead sight on it. Trijicon sells them. That should be all the sighting system you need for any forseeable defensive situation.

If you want to add more range, just in case the zombies come, get some 3" magnum rifled slugs. They're good to about 65meters in an 18" smoothbore bbl.