Ovenmit informed us he released an updated version of the SA58 which he ported from Arma 2 on the BI forums.

Quote :
I have ported one of my favourite weapons from Arma 2. Everything seems to be working as far as I can see. New muzzle system is in place.
I may still tweak the config based on comments or my own findings. I plan to make a new texture too in a future release.

Changelog:
• Ammo tweaks
  
• Added Joint Rail support

Although it will work without ASDG Joint Rails it is strongly recommended you have it.