When testing an M249 against a zombear.
It seems to be an issue with range; at range 4 they were able to consistently hit; but turrets will automatically fire at whatever’s in range and for the M249 that’s pretty significant.
Bumping this because it’s still not fixed.
Edit: It seems that turret accuracy is directly linked to the weapon’s volume. The higher the volume, the more inaccurate the weapon.