The real problem with the BE2c is that now it fires to the left instead right where the gun is pointed at.
When I deactivate the BE2c files the missions wont work.
This is easily corrected:
Look for the mesh called Turret1C_D0 in your folder #SAS\BE2C\3do\Plane\BE2c
replace the lines:
[HookLoc]
-0.422618 -0.906308 0 0.906308 -0.422618 0 0 0 1 -0.28 -0.6746 0
by:
[HookLoc]
0.34202 -0.939693 0 0.939693 0.34202 0 0 0 1 -0.28 -0.6746 0
(let the second line of the HookLoc entries as it is)