Q XL Whistle Tip Blast Mitigation Device, 338 Caliber, 8.6mm, QD, 1.85in, Copper, ACC-WHISTLETIP-XL

It also serves as a Cherry Bomb thread protector for the poors who don't / can't own a silencer. 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.