Hi thereaverofdarkness,
So far I'm not able to reproduce the issue on 0.16.45. I loaded up a test game and used console commands to research all technology. On loading a vanilla turret with yellow ammo, the DPS value is 942.5 (25/s fire rate, 37.7 damage per bullet) DPS. On loading a turret from this mod with yellow ammo, the DPS came out to 904.8 DPS (15/s fire rate, 60.32 damage per bullet).
With no technology researched, the vanilla gun turret comes to 50 DPS (10/s fire rate, 5 damage per bullet), while LR turret comes out to 48 DPS (6/s fire rate, 8 damage per bullet). Once more, this is using yellow ammo.
All of these numbers are the expected result.
First, please check that the mod is up to date. If you're still experiencing the issue, could you send me the save game file?
Thanks!