The Advanced Tactical Commentator (ATC) by Seekins Precision is built to high standards, and is an ideal addition to virtually any rifle set up. The ATC's port design dramatically reduces both felt recoil and muzzle rise, promoting faster follow up shots and increased target transitions. In addition, it ships with a timing nut, making installation simple, and is available in multiple calibers. Features: Made from high quality 416 Stainless SteelAvailable in multiple calibersAvailable in Surface Element Treatment or Bead Blast finishesShips with timing nut for easy installation Seekins ATC SS 5/8-24 Muzzle Brake 0011510037-F