Our 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 Direct thread on your Nomad, Primal, Lazarus 6, Sandman X and other HUB compatible silencers Product Specifications Finish: QPQ Black Nitride Material: 4140 HT Alloy Steel Overall Length: 0.765" Weight: 1.62 oz