Looking to reduce as much weight and length as possible with your build? The Kurz Q.D, Adapter from YHM allows the user to shorten their Phantom Q.D. mounting system by .675 on any suppressor utilizing the 1-3/8-24 rear mounting threads. Don’t just reduce size and weight from your build, do it with style and the durability you’ve come to know and love from YHM products. 1-3/8″-24 Thread Mount. 17-4 Stainless Steel. Matte Black Oxide Finish. Reduce Length by .675″. Weight: 2.0 Oz.. Allows the use of YHM Q.D. Mounts to be used on suppressors utilizing 1-3/8″-24 threads.