Re: CTD when using turret
What platform?
If PC
Do you use any mods?
Disable "Origin in Game"
Try to repair the game.
(Origin > Game Library > right click ME3 > Repair / Steam > right click at ME3 > Properties > Local Files > Verify integrity of game cache.)
If that don't helps, create a DxDiag in text file format and post it with your next reply.