Introducing the "Russian MP5" PP 19 Vityaz, which is currently used by Russian special forces like the FSB and Spetznaz. The PP-19 Vityaz is a selective fire submachine gun that uses a simple closed bolt, straight blowback method of operation. As such, it has no gas system and the internal components have been modified accordingly. The bolt carrier and its integral charging handle is similar to  the AK-family, however the piston rod and rotary bolt were removed and a weight on the bolt extends into the previous gas tube. The return spring and guide rod are almost identical to those of the AK-family.