Section 237(i) in Police Regulations, Bengal , 1943
(i)The arms and ammunition kept in police-stations are intended for the suppression of serious riots likely to be attended with loss of life, or for cases in which the officer-in-charge of the police-station has reason to believe that the person to be proceeded against may be armed with deadly weapons. On such an occasion arising, the officer-in-charge of a police-station shall issue such number of arms as may be necessary with 20 rounds of ball ammunition per arm. If more than one constable is taken out, the senior of the trained constable shall take charge of the armed party and act as squad commander under the orders of the Sub-Inspector or Assistant Sub-Inspector or head constable.