Aim\ The feasibility of magnetorheological fluid technology in automatic weapon is discussed. Methods\ Magnetorheological fluid technology is introduced. The working program
electrical source and the buffer miniaturization are studied. Results\ Magnetorheological fluid technology develops rapidly
and some successful applications are found in some fields. Some key technology for the weaponry can be solved. Conclusion\ The magnetorheological fluid technology can be applied in the buffer of automatic weapon.