Energetic Armament EA21 Direct Thread Adapters 5/8x24 Titanium
https://www.tandktactical.com/shop/853406008213-energetic-armament-ea21-direct-thread-adapters-5-8x24-titanium-42073
https://www.tandktactical.com/web/image/product.template/42073/image_1920?unique=3c0d0d5
fits Industry standard 1.375"x24 thread
