Check out Optics Planet, they have great deals on scopes. Really like the "Buckmaster" scopes...Nikon glass, very clear. Also, Nikon now makes glass for the P-223. The scope is made specifically for .223 AR's. (somehow) they have matched the glass to the .223 ballistics. I am a little confused though, if this rifle is specifically for home defense, why a scope at all??? You will get much faster target aquisition with "iron sights". If an intruder is ducking, shucking, and jiving behind walls and furniture the scope is going to be a liability, not an asset, unless of course you live in a mansion with 200 foot rooms. Best home defense is a pump-shotgun with double 00. Hell, they will run when they hear you jack a shell into the chamber.