 They have also appeared in several movies and video games.Serbu has produced a variety of small-quantity firearms in the past, including a .22LR pen gun called the "Butt-master" and an integrally-suppressed Ruger MK II pistol called the "SIRIS".Serbu has also produced a .22LR muzzle suppressor called the "C-CAN" and an integrally suppressed Ruger 10/22 rifle called the "SIRIS 1022".