GTW Prometheus R
The GTW-5a Prometheus "R" is a retrofitted version of the Great War-era Prometheus cannon (now designated GTW Prometheus S). It maintains the original weapon's high hull damage, but has lost the shield-destroying punch. It is best used in conjunction with another weapon that does high shield damage.
Overall the Prometheus R is a difficult weapon to recommend. It has a lethargic rate of fire, and consumes a lot more power than other basic weapons like the GTW Subach HL-7. The Subach seems to make up for its lower damage with greater rate of fire and better energy efficiency. Even the Prometheus R's high compatability isn't an advantage, since the S variant also has compatability with most ships.