Saints in tandem: Two sizes means no compromising a perfect fit for the deployable self-defense tool that matches your style.
Pistol-caliber carbines are hot. Rifle designs built as pistols are hot. Ruger has combined the two and added even more.
If excellence in the AR-15 platform is what you are looking for, try Warrior Systems Manufacturing's WSM15. This is a solid and accurate rifle with great aesthetics and a reasonable price tag.
When you consider a compact rifle for home defense, you might think of an AR-15 style semi-auto; however, there is much to be said for the bolt gun in this scenario, too.