Energetic Armament EA23 Direct Thread Adapters 9/16x24 Titanium
https://www.tandktactical.com/shop/853406008237-energetic-armament-ea23-direct-thread-adapters-9-16x24-titanium-42075
https://www.tandktactical.com/web/image/product.template/42075/image_1920?unique=ffae6e4
fits Industry standard 1.375"x24 thread
