This is a covert full edition of the Manex STR77. The 4004 isn't really a semi-automatic version, but has an intuitive AT-B-responser to choose between single-shot, three-round burst and full auto. AT-B stands for 'Advanced Toiler-Bots' (many regard this as self-contradiction, since Toiler-Bots can't be advanced). 'Mist Reception Sorrow' is a common clan modification of the gun.

This is a covert full edition of the Manex STR77. The 4004 isn't really a semi-automatic version, but has an intuitive AT-B-responser to choose between single-shot, three-round burst and full auto. AT-B stands for 'Advanced Toiler-Bots' (many regard this as self-contradiction, since Toiler-Bots can't be advanced). 'Mist Reception Sorrow' is a common clan modification of the gun.