FIND IT HERE! https://doublemdefense.com/product/diligent-defense-ti-direct-thread-adapter-m18x1-5-8-6b/ 

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SKU: DTA-M18

Item Description:

Diligent Defense Co direct thread adapter M18x1.5 8.6B. These are simplistic and light as shit.
 
Industry standard 1-3/8″x24tpi
-Machined from 6-4 titanium
-Features a hex on both sides of the product.
-Adds 1/4″ to the overall length of your can.