Yankee Hill Machine Co Kurz QD Adapter, Titanium, 1-3/8-24 Rear Mounting Threads, Matte Finish, Black YHM-3051-Ti Looking to reduce as much weight and length as possible with your build? The Titanium 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 and is 40% lighter than the 17-4 stainless steel version. 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.