Maxim Defense MXM47707 Hate Brake Black DLC 17-4 Stainless Steel with 1/2″-28 tpi Threads, 2.40″ OAL, 1.50″ Diameter & Octagon Shape for 5.56x45mm NATO
True Precision Inc TPSMICROSS Micro Compensator S-Type Satin Stainless 416R Stainless Steel 1/2″x28 Threads 9mm/380 ACP