Recessed direct thread HUB (1.375x24tpi) adapter seats over your barrel and reduces overall length by 0.5" with silencer installed
 
Machined from 17-4 stainless steel
Black nitride finish
Adapts to SilencerCo BRAVO HUB or any other 1 3/8 x 24 threaded muzzle devices
Install with a 1.5" spanner wrench
 
Available thread pitches:
1/2x28
5/8x24
Sig/Q Tapered barrel 
 
Diameter: 1.5"
Weight: 1.9 - 2.1oz.
Minimum clearance to first baffle: 0.95"