Q LLC WHISTLETIPPVD Whistle Tip Blast Mitigation Device QD, Black PVD, 1.85" L, 1.16" D, For Cherry Bomb Brake The Whistle Tip Is a Blast Mitigation Device (BMD) For Q LLC's Cherry Bomb Muzzle Brake. It Also serves as a Cherry Bomb Thread Protector. As You've Come To Expect, The Whistle Tip features a Taper Mount For Proper Alignment To The Cherry Bombs And installs With Any Off The Shelf 1-Inch Wrench. This Will Not Fit Onto The Xl Cherry Bomb (M18-1.5) Model: Whistle Tip Finish: PVD