B.R.S.S. system simulates the recoil force of a real rifle by transferring the kinetic energy from piston to the reciprocating weight hammer inside the stock using a high efficient energy transferring mechanism.
Military – SWAT Series
The basic idea of SWAT model basic idea was from MP5-J of Japan. BOLTs version of the SWAT series is different, providing a realistic recoil with their BRSS system.