The Griffin Armament Taper Mount PLAN-A adapter provides a low profile (only adds .430" in length) Griffin Taper Mount interface for Griffin pistol silencers, and other suppressors with mount interface inside diameter threading of 1.125x28 such as Silencerco Octane, Octane 9K, Octane 45k and Rugged Suppressors Obsidian. No proprietary tools required. Machined from billet 17-4 stainless steel, this adapter provides a precision made interface that gives you access to nationally recognized Griffin Taper Mounts and accessories. Precision, performance, durability, and value are at the core of Griffin product design and manufacturing. This product allows you to affordably kit up with the best muzzle devices in the industry. Features17-4 PH SS Billet MachinedBlack Nitridedonly adds .430" in length to host silencer1.1 Ounce WeightTaper Mount Repeatability and versatility