Ultradyne USA Apollo S Compensator Muzzle Brake with Timing Nut, AR, 223/556, 1/2"-28 Thread, .975" Outside Diameter, Steel Nitride UD10220
Specifications:

Type
Model	Apollo S
Dimensions
Size
Material	416R Stainless Steel
Action
Trigger
Safety
Thread Pattern	1/2"-28 tpi
Finish	Nitride
Bolt Type
Hand
Hammer Type
Capacity