YHM MINI QD MUZZLE BRAKE 1/2-28 Introducing the highly anticipated Mini QD Brake for YHM's fast attach sound suppressor systems. The Mini QD brake is YHM engineering perfection. Compact at only 1.6 inches and weighing in 3.2oz the Mini QD brake was designed for today's competitive shooter. No short cuts were taken, and users will find that the Mini QD brake is still capable of being shot comfortably unsuppressed as well as suppressed. With a through bore of .350" the Mini QD Brakes are compatible with all of our YHM Phantoms, Turbos, Turbo Ks, Resonators, and Nitros. Currently Available in 1/2-28 and 5/8-24 thread pitches. Upgrade your favorite firearms today with a Mini QD Brake. Specifications • 1.6" overall length, adds approx. 1" to overall barrel length • 3.2 Oz. • Melonite QPQ finish • Includes Shim Set for barrel timing.