The Obsidian 9 is a hard use, user serviceable suppressor that uses what Rugged Suppressors call “ADAPT Modular Technology” where the suppressor can be reduced in length to almost half it’s size in the short configuration giving you the equivalent of two suppressors with one tax stamp.  It features a non slotted piston for attachment to your firearm, lowering gas blowback and they are cross compatible with SilencerCo Slotted pistons.