The American Precision Arms G4L5865N Gen 4 Little Bastard Self Timing Nitride brake delivers unmatched flatness with its calibrated U.R.P tunable top ports, designed to maximize adjustment and deliver zero vertical movement by precisely testing port size, location, and gas flow to optimize recoil reduction and muzzle rise. Built with a 5/8"x24 thread pattern and a nitride finish, this Gen 4 muzzle device measures 2.70 inches in overall length and 1 inch in diameter, making it a compact yet highly effective addition to 6.5mm rifles where precise control and rapid follow-up shots are critical. The Little Bastard Gen 4 integrates seamlessly into rifle setups that demand consistent recoil management without sacrificing accuracy, offering a clean, reliable bore alignment and durable performance under demanding field and range conditions. Ideal for precision hunters and competitive shooters, this brake enhances shot-to-shot consistency by maintaining predictable muzzle behavior across varied loads and environments. With its robust construction and tunable top ports, the G4L5865N stands out as a purpose-built muzzle device that supports steady aiming, improved cadence, and improved overall rifle handling for serious shooters.