Find It Here: https://doublemdefense.com/product/cgs-hyperion-thread-adapter-1-2x28/ 

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Factory New.

UPC: 850002123333

Item Description:

Hyperion thread adapters are 17-4 stainless steel construction, H900 heat treated and have been DLC and SLine coated.  They come in 1/2 x 28.  Hyperion Thread Adapters in 1/2×28 are only for use on 5.56 firearms.