Instruction manual in english for those of you that are fortunate enough to own a Systema TW5-A4 (MP5). This is a 2008 manual as i am unable to locate a 2012.
One note about disassembly for the first time: The lower receiver (grip frame) is super tight (like a german nun) and it feels uncomfortable to pry, i suggest using a thin slotted screwdriver and gingerly ease the back of the receiver (grip frame) from the upper receiver.
have fun!