Primary Weapons Systems BDE PUB XL Mount Fits HUB Suppressors Black 1.375x24 Thread Pitch. By equipping PUB mounts to HUB compatible suppressors users can easily swap suppressor on their various host firearms while maintaining concentricity. Specifications for Primary Weapons Systems BDE PUB XL Mount: Manufacturer: Primary Weapons Systems Color: Black Finish: Black Additional Features: Mount Handle Color: Black Features of Primary Weapons Systems BDE PUB XL Mount: Fits HUB Compatible Suppressors Package Contents: Primary Weapons Systems BDE PUB XL Mount Primary Weapons Systems BDE PUB XL Suppressor Mount Fits HUB Compatible Suppressors Black