A compact AR-platform pistol featuring a four-inch barrel offers a balance between maneuverability and ballistic performance within legal constraints. This configuration is popular for home defense and close-quarters engagements due to its compact size and ease of handling in confined spaces. An example would be a short-barreled rifle (SBR) or AR pistol legally registered and configured with the specified barrel length.
The shorter barrel length provides advantages in confined environments while still delivering sufficient energy transfer for defensive purposes. Historically, shorter barrels were also favored for concealment and ease of transport. The legality of such configurations varies by jurisdiction and often requires specific permits or registrations. The platform’s inherent modularity allows for customization with various accessories such as braces, sights, and lights, further enhancing its utility.