early Tu-4 gun turrets i think you need this...

[TailGunner]
SystemType=GUNNER_STATION
SeatID=3
GunnerID=1
PilotModelName=
SetCockpitPosition=FALSE
Position=0.0,-19.0, 0.4
MinExtentPosition=-0.5,-19.5,-0.2
MaxExtentPosition=0.5,-18.5,1.0
PitchModelNodeName=TailGun
YawModelNodeName=TailGunTower
GunRange=2000
PitchAngleRate=30
MaxPitch= 30
MinPitch=-30
DefaultPitchAngle=0
YawLimited=TRUE
YawAngleRate=45
MaxYaw=210
MinYaw=150
DefaultYawAngle=180
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6
TargetType=AIR
RadarSearchTime=2.0
RadarSearchRange=20000.0
RadarSearchStrength=80
RadarTrackTime=20.0
RadarTrackRange=4000.0
RadarTrackStrength=75
RadarPosition=0.0,0.0,2.30
RadarMinimumRange=100.0
RadarMinimumAlt=50.0
DataLink=TRUE
OpticalSight=TRUE
NightSight=TRUE
VisualRange=2500.0

[BBGunner]
SystemType=GUNNER_STATION
SeatID=4
GunnerID=2
PilotModelName=
SetCockpitPosition=FALSE
Position=0.0000,-12.5,-1.0
MinExtentPosition=
MaxExtentPosition=
PitchModelNodeName=GunBB
YawModelNodeName=GunTowerBB
GunRange=2500
PitchAngleRate=30
MaxPitch= 4
MinPitch=-90
DefaultPitchAngle=0
YawLimited=FALSE
YawAngleRate=45
MaxYaw= 300
MinYaw= 60
DefaultYawAngle=180
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TBGunner]
SystemType=GUNNER_STATION
SeatID=5
GunnerID=3
PilotModelName=
SetCockpitPosition=FALSE
Position=0.0000,-6.741,1.0
MinExtentPosition=
MaxExtentPosition=
PitchModelNodeName=GunTB
YawModelNodeName=GunTowerTB
GunRange=2500
PitchAngleRate=30
MaxPitch=90
MinPitch= -2
DefaultPitchAngle=0
YawLimited=FALSE
YawAngleRate=45
MaxYaw=320
MinYaw=40
DefaultYawAngle=180
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TFGunner]
SystemType=GUNNER_STATION
SeatID=6
GunnerID=4
PilotModelName=
SetCockpitPosition=FALSE
Position= 0.0000,6.695,1.0
MinExtentPosition=
MaxExtentPosition=
PitchModelNodeName=GunTF
YawModelNodeName=GunTowerTF
GunRange=2500
PitchAngleRate=30
MaxPitch= 90
MinPitch= -4
DefaultPitchAngle=0
YawLimited=FALSE
YawAngleRate=45
MaxYaw= 90
MinYaw= -90
DefaultYawAngle=0
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[BFGunner]
SystemType=GUNNER_STATION
SeatID=7
GunnerID=5
PilotModelName=
SetCockpitPosition=FALSE
Position=0.0000,6.4,-2.01
MinExtentPosition=
MaxExtentPosition=
PitchModelNodeName=GunBF
YawModelNodeName=GunTowerBF
GunRange=2500
PitchAngleRate=30
MaxPitch= 4
MinPitch= -90
DefaultPitchAngle=0
YawLimited=FALSE
YawAngleRate=45
MaxYaw=90
MinYaw=-90
DefaultYawAngle=0
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TailGun1]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= -0.1,-19.0, 0.4
MaxAmmo=850
TracerLoading=3
BurstAmount=10
GunnerID=1
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TailGun2]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= 0.1,-19.0, 0.4
MaxAmmo=850
TracerLoading=3
BurstAmount=10
GunnerID=1
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[BBGun1]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= -0.100,-12.5,-1.0
MaxAmmo=420
TracerLoading=5
BurstAmount=10
GunnerID=2
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[BBGun2]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= 0.100,-12.5,-1.0
MaxAmmo=420
TracerLoading=5
BurstAmount=10
GunnerID=2
MinExtentPosition=-0.44,-5.78,-0.54
MaxExtentPosition= 0.44,-4.71, 0.52
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TBGun1]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= -0.100,-6.741,1.0
MaxAmmo=400
TracerLoading=5
BurstAmount=10
GunnerID=3
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TBGun2]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= 0.100,-6.741,1.0
MaxAmmo=400
TracerLoading=5
BurstAmount=10
GunnerID=3
MinExtentPosition=-0.44,-5.78,-0.54
MaxExtentPosition= 0.44,-4.71, 0.52
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TFGun1]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= -0.100,6.695,1.0
MaxAmmo=400
TracerLoading=5
BurstAmount=10
GunnerID=4
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[TFGun2]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= 0.100,6.695,1.0
MaxAmmo=400
TracerLoading=5
BurstAmount=10
GunnerID=4
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[BFGun1]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= -0.10,6.4,-2.01
MaxAmmo=270
TracerLoading=5
BurstAmount=10
GunnerID=5
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[BFGun2]
SystemType=FLEXIBLE_GUN
GunTypeName=20MM_B-20
MuzzlePosition= 0.10,6.4,-2.01
MaxAmmo=270
TracerLoading=5
BurstAmount=10
GunnerID=5
MinExtentPosition=
MaxExtentPosition=
HasArmor=TRUE
ArmorMaterial=STEEL
Armor[FRONT].Thickness=6
Armor[RIGHT].Thickness=6
Armor[LEFT].Thickness=6
Armor[REAR].Thickness=9
Armor[TOP].Thickness=6
Armor[BOTTOM].Thickness=6

[GunData162]
TypeName=20MM_B-20
FullName=20mm B-20 Cannon
Caliber=20.000000
ROF=800.000000
MuzzleVel=800.000000
AmmoWt=0.096000
WarheadWt=0.006700
Reliability=96.000000
Accuracy=80.000000
AddLight=TRUE
MaxLightRange=1000.000000
FireColor=0.250000,0.225000,0.160000
GunFireEffect=20mmFireEffect
GunFireSound=Cannon
EffectClassName=20mmEffects
EffectTime=0.100000
TracerTexture=Tracer2.tga
TracerSize=0.150000
TracerDistFactor=0.002000
TracerLength=0.015000
MaxVisibleDist=4000.000000
MaxStreakVisibleDist=1000.000000
TimeFuzed=FALSE