Relastivistic turret does not seem to do anything.
Turrets shoot weirdly on short distances.

From the OP:

-Turret behavior can be kinda buggy, I placed a turret on the ground next to some enemies and it shot a few through walls, and was unable to hit an enemy at POINT BLANK range (Targets closer than 2 blocks will NOT be killed by most sentry guns)

-Relativistic turret doesn't seem to do anything

Which version?

AS for the drop turrets, I know that, range incositency I for not have not yet seen, and also the turrets not hitting at point blank is an issue.

Version is the current latest available (openmodularturrets-1.12.2-3.0.1-264.jar)

Here's a short recording of the issue with the range upgrades. After I stopped recording I found the range of the sentry gun went up despite the range upgrades having been removed.

Here are some clips of the issue in action 1 [2]

The sentries don't seem to generate anything in the log.

P.S, I can't shift click to fill ammo inventories

Ok, gonna start working on those. Thanks for reporting!

Splitted this issue so I can better track the bugs.

Its all fixed now, the relativistic turret slows and weakens enemies btw.