Its a skin of the weapon and there is another mod that changes the sound of firing weapons, With and without the mod and sound it doesnt works it keeps shooting 3 shoots only. It was working so perfect with the mod, without the mod it doesnt works. Also i removed all sounds of the weapons and stills having the same problem (I have skin mod and change sound of firearms).
Note: The county rifle its working good that has the same anim it works good. SOMETIMES it shoots 1 shot and does the anim and there is the sound of the weapon firing.