American Precision Arms has combined the standards of high-level performance and reliability. Among the design, changes are three key features. The advanced Unique Recoil Profile tunable top port design allows the shooter to fine-tune the muzzle movement for absolute target retention. In addition to that, the new lock nut design creates a zero over rotating platform. Last is the addition of a fourth Bastard port section that eliminates even more recoil than before. *Note- Made for a barrel diameters of .750 to 1". The Gen 3 Little Bastard can handle magnum cartridges. Includes- set screws, Allen wrench and a single-use Threadtite.