Can somebody help in changing statistic of a weapon from a mod ?

[BartegUnified 0]

So I have a modded weapon, an Mk-I EMR which fires a 6.5 round
It is fired at 940 m/s and lets say I wanted to change it to 980 m/s
I am entirely new to that and my experience in modding Arma is basically zero, so I need help with that
tried changing the stats it .pbo of the mod, it obviously did not work, just tested
can somebody help ?

[pierremgi 4738]

Don't double post, please.