A pistol-length AR-15 without a stock is known as an AR-15 pistol (only rifles have stocks but pistols can have a brace). The pistol buffer tube or something similar on an AR-15 handgun prevents the attachment of a stock. A pistol is defined by the absence of a vertical foregrip. The AR-15 platform is great for personal defense in most cases. The most common place an AR-15 would be employed for self-defense is in the home. Since an AR-15 pistol's shorter barrel makes it more manageable in enclosed spaces, it is a potent tool for self-defense in such a situation. The shorter pistol length in the AR-15 enables increased maneuverability and overall enhanced ergonomics that enable the user to move in and out of tight spaces in a flexible manner while keeping target acquisition in mind.