Armaspec Harmonics-Tuner Muzzle Brake The Armaspec Harmonics-Tuner Muzzle Brake goes beyond traditional recoil reduction by integrating an adjustable barrel tuner into the brake itself. Its threaded front section allows fine, incremental adjustments to tune barrel harmonics to your specific barrel and ammunition, helping tighten groups without changing loads or chasing velocity nodes. Designed for shooters focused on precision, it delivers effective recoil control while offering a practical way to maximize accuracy from the ammo you already shoot.