The SUB CQB offers compact storage and superior pistol caliber firepower, however this one is Hollywood quiet when paired with subsonic ammo. It features a rotating barrel shroud, simply pull up on the locking tab and rotate the hand guard 90 degrees, then fold the gun just like a standard SUB2000. The barrel and suppressor are one unit. The baffles are shrouded by a rotating hand guard and locked in by a removable end cap. This design allows for easy and thorough cleaning and reassembly. The SUB CQB has 4.25 of rifling in a 16 baffled barrel. 1 of 2, sold with SS #142401, KEL ISB9 9MM SBN Suppressor Glock 17.