This gun has no meaning compared to razor , and it is stated many times. But there is one utilization which could be interesting.
Imagine that death ray creates a radius field when fired catch equipment of a ship in an effect similar to passin near some ultra high radioactive field when equipment deteriorate.
Idea is that such ship emmiting field can tear apart with neough given time equip of enemy ships who are caught in the blast.
Maybe ti make gun is only efective when shields of enemy ships down maybe.
Maybe it can be turned on and off and have some effect radius which can deter snubs and crafts to engage in close dogfight (something like star wars 6 when rebel fleet evade deats star shield perimeter)
If death ray activated it can maybe drain power , if you have 2 on board zou got double radius but double power drain and so forth...
This is some interesting concept to spice tactic and engage , but need to be carefully balanced , for instance BS death ray should disable lesser ships easier than other BS ...
Of course to add that kind of weapon should carry Battlecruisers and BS only who have power and armour to tacticallz utilize it
Is this line of ideas worth expanding ? Well , make a feedback.