- Install Fastman92LimitAdjuster (https://www.gtainside.com/en/sanandreas/tools/147423-fastman92-limit-adjuster-5-2/)

- Uncomment and enable Id Limit Patch in fastman92limitAdjuster_GTASA.ini file, like this:
  Apply ID limit patch = 1

- Uncomment and enable model special feature loader in fastman92limitAdjuster_GTASA.ini file, like this:
  Enable model special feature loader = 1

- Add these lines below #new_hydra hydra in model_special_features.dat file and save it, inside of data folder:

#new_hydra hydra
sparrow hunter
seaspar hunter

- Try in game.

- Done

Video of working miniguns and rockets
https://youtu.be/Nf5Yv4YX8pQ