You can find the Ultradyne Apollo Max Compensator 5.56 here.

The Ultradyne Apollo Max Compensator provides recoil reduction and unparalleled muzzle compensation by diverting the gases away from the shooter and out of the shooter's line of sight. Minimum barrel length for the Apollo Max is 16". Machined from 416 Stainless Steel and treated with an ultra-rugged salt bath nitride finish. Includes a timing nut for easy installation.

Caliber: .223/5.56
Threads: 1/2X28
Weight: 4.4 oz
Length: 2.94"