The Wolfpack Armory Plan B HUB Adapter Gen 3 now has improved compatibility with other manufacturers muzzle devices. Low Profile design minimizes overall length added to your setup. Compatible with Plan B and Rearden type muzzle devices. FeaturesMachined from 17-4 stainless steelAdapts to SilencerCo BRAVO HUB or any other 1 3/8 x 24 threaded muzzle devicesInstall with a 1.5" spanner wrench