How tight are your doorways and hallways? Get that unloaded and open rifle into every tight spot you have, and see how easy it is to maneuver while confined in a "box". I am of the opinion that a pistol caliber carbine gives nothing to, and takes away from a person defending a home, except the fear factor of the bad guy seeing the good guy with a rifle. My opinion is sometimes in the minority.
if I grab a long gun, it will be in a long gun caliber, BUT, that's just me.
If you like it and it works well for you, then by all means, have fun. Always remember a weapon mounted light means your firearm is pointed at whatever you see, be it target or scared family member.