all's I'm saying is that sort of tactical training for homeowners is almost completely unnecessary. If you want to do it, then great. I think the money would be better spent, for most people, for range ammo. The firing of a real gun in an artificial environment is IMHO better than the firing of an unreal gun in your home for training purposes.
If you really really want to practice "sweeping" your house or whatever, I believe you could do so with your unloaded real gun. Shooting little plastic pellets doesn't seem to make a lot of sense to me, because what you're really going to have to deal with is not various guys moving around the house shooting at you from behind cover while you do commando rolls behind the bidet, etc., , but the simple fact that you're going to have to 1) get one of your guns in a hurry 2) possibly shoot the gun indoors and 3) watch the bad guys run like the Keystone Kops back to where they came from.