Rugged Suppressor OA001 Obsidian 3-Lug Black Rugged Suppressors 3 Lug Mount replaces The Piston Assembly In Your Obsidian, Allowing You To Attach The Obsidian 45 And Obsidian 9 To 3 Lug Compatible Firearms. Note: This Is The Can Mount Only. To Attach, Your Firearm Must Have Integral 9mm 3 lugs Or a 9mm 3 Lug Adapter. Model: Obsidian Finish: Black Type: Mounting Adapter