4 Vent Muzzle Brake  with Wrench Flats, 5/8 x 24 ID Thread

Precision machined from 4140 ordnance grade steel with black magnetite protective finish. 

Outside Diameter = .850"
Overall Length = 1.750"
Weight  = 2.6oz

Photos taken with a 7.5" barrel using .300 AAC Blackout 123 Grain FMJ (supersonic) - Magtech First Defense