lsw/avenger was just an example, Lets say u remove ammo and guns from encounters and keep guns/dmg unchanged, in that case its still gonna be imbalanced, it cannot be since u have a gun that is 4 times more expensive and does only 10% more dmg than others ( and the problem begins when u die and lose it all, full loot game ...).
It can only go in 2 directions, assault/shotguns/bigguns/plasma,laser rifle (fast shoots) dps guns, everything else+aim shoots as support - break legs,arms,eyes knock downs, knock outs.
or
rock/paper/scissors - armor/guns system but its another story