Seekins Precision 0011510033 ATC Muzzle Brake 223 Rem,5.56 Nato 1/2"-28 tpi Stainless Steel The Seekins Precision Advanced Tactical Compensator (ATC) Was engineered To Be The Most Innovative, Best performing Compensator Available. The Port Design minimizes The Amount Of Recoil Felt And reduces Muzzle Rise. The Incredible Performance Of The ATC Allows faster Follow Up Shots And quicker Target transitions. With An Easy To Install Timing Nut This ATC Allows For An Immediate Upgrade Of Your Rifle. Model: ATC Material: 416 Stainless Steel Thread Pattern: 1/2"-28 tpi Finish: Stainless Steel