Dead Air fixed mount inserts let you mount your suppressor on more firearms. These are HUB compatible (1 3/8-24) and available in a variety of thread pitches. This is what you need for your Nomad, Primal, and other HUB compatible silencers. SPECIFICATIONS: Finish QPQ Black Nitride Material 4140 HT Alloy Steel Thread Pitches offered 1/2-28, 11/16-24, 9/16-24RH, .578-28, 3/4-20, 3/4-24, 5/8-24, 5/8-24 SIG TAPER, M18-1, M18-1.5 AI Overall Length LT301: 0.765a ^2 LT302: 0.765a ^2 LT303: 0.765a ^2 LT304: 0.765a ^2 LT305: 0.765a ^2 LT306: 1.750a ^2 LT311: 0.765a ^2 LT312: 0.765a ^2 Mfg: Dead Air Armament