The seekins precision advanced tactical compensator (atc) is engineered to be the most innovative best performing compensator available.It features an optimal port configuration and quantity for maximum reduction of felt recoil and muzzle rise.Included is a timing nut to make installation and removal for making cleaning a breeze.The seekins precision atc is designed to be used on barrels with muzzles no larger than.750.Stainless steel construction innovative design and unrivaled reduction in muzzle rise and recoil make the atc the best compensator available.This model has a black melonite finish and 5/8x24 tpi threads.Finish: MeloniteType: Muzzle BrakeModel: ATCMaterial: 416R Stainless SteelThread Pattern: 5/8"-24 tpi