Allow your CGS Hyperion to be threaded on to 1/2-28 barrels.
The Hyperion 1/2-28 thread adapter is only for use on 5.56/.223.
Hyperion thread adapters are 17-4 stainless steel construction, H900 heat treated, and have been coated with DLC and SLine. They come in 1/2-28 and 5/8-24 internal threads. Hyperion Thread Adapters in 1/2-28 are only for use on 5.56 firearms.