diff --git HighEnergyPhysics/FeynArts-3.7/Models/Dirac.gen HighEnergyPhysics/FeynArts-3.7/Models/Dirac.gen
index 1c19b77..963af3f 100644
--- HighEnergyPhysics/FeynArts-3.7/Models/Dirac.gen
+++ HighEnergyPhysics/FeynArts-3.7/Models/Dirac.gen
@@ -23,11 +23,11 @@ P$NonCommuting = U
 
 Attributes[ MetricTensor ] = Attributes[ ScalarProduct ] = {Orderless}
 
-
+(*
 FourVector/: -FourVector[ mom_, mu___ ] := FourVector[Expand[-mom], mu]
 
 FourVector[ 0, ___ ] = 0
-
+*)
 
 SpinorType[j_Integer, ___] := MajoranaSpinor /; SelfConjugate[F[j]]
 
diff --git HighEnergyPhysics/FeynArts-3.7/Models/DiracU.gen HighEnergyPhysics/FeynArts-3.7/Models/DiracU.gen
index a37397b..4c38cf1 100644
--- HighEnergyPhysics/FeynArts-3.7/Models/DiracU.gen
+++ HighEnergyPhysics/FeynArts-3.7/Models/DiracU.gen
@@ -21,11 +21,11 @@ $FermionLines = False
 
 Attributes[ MetricTensor ] = Attributes[ ScalarProduct ] = {Orderless}
 
-
+(*
 FourVector/: -FourVector[ mom_, mu___ ] := FourVector[Expand[-mom], mu]
 
 FourVector[ 0, ___ ] = 0
-
+*)
 
 SpinorType[j_Integer, ___] := MajoranaSpinor /; SelfConjugate[F[j]]
 
diff --git HighEnergyPhysics/FeynArts-3.7/Models/Lorentz.gen HighEnergyPhysics/FeynArts-3.7/Models/Lorentz.gen
index a34f6a8..c49ccf4 100644
--- HighEnergyPhysics/FeynArts-3.7/Models/Lorentz.gen
+++ HighEnergyPhysics/FeynArts-3.7/Models/Lorentz.gen
@@ -23,8 +23,10 @@ KinematicIndices[ U ] = {}
 $FermionLines = True
 P$NonCommuting = F | U
 Attributes[ MetricTensor ] = Attributes[ ScalarProduct ] = {Orderless}
+(*
 FourVector/: -FourVector[ mom_, mu___ ] := FourVector[Expand[-mom], mu]
 FourVector[ 0, ___ ] = 0
+*)
 SpinorType[j_Integer, ___] := MajoranaSpinor /; SelfConjugate[F[j]]
 SpinorType[_Integer, __] = DiracSpinor
 M$GenericPropagators = {
diff --git HighEnergyPhysics/FeynArts-3.7/Models/Lorentzbgf.gen HighEnergyPhysics/FeynArts-3.7/Models/Lorentzbgf.gen
index a75da27..14d19e5 100644
--- HighEnergyPhysics/FeynArts-3.7/Models/Lorentzbgf.gen
+++ HighEnergyPhysics/FeynArts-3.7/Models/Lorentzbgf.gen
@@ -23,8 +23,10 @@ KinematicIndices[ SV ] = {Lorentz};
 KinematicIndices[ U ] = {}
 $FermionLines = True
 Attributes[ MetricTensor ] = Attributes[ ScalarProduct ] = {Orderless}
+(*
 FourVector/: -FourVector[ mom_, mu___ ] := FourVector[Expand[-mom], mu]
 FourVector[ 0, ___ ] = 0
+*)
 SpinorType[j_Integer, ___] := MajoranaSpinor /; SelfConjugate[F[j]]
 SpinorType[_Integer, __] = DiracSpinor
 M$GenericPropagators = {
diff --git HighEnergyPhysics/FeynArts-3.7/Models/QED.gen HighEnergyPhysics/FeynArts-3.7/Models/QED.gen
index 941b58c..31ec73e 100644
--- HighEnergyPhysics/FeynArts-3.7/Models/QED.gen
+++ HighEnergyPhysics/FeynArts-3.7/Models/QED.gen
@@ -13,8 +13,10 @@ KinematicIndices[ F ] = {};
 KinematicIndices[ V ] = {Lorentz}
 IndexStyle[ Index[Lorentz, i_Integer] ] := Greek[i + 11]
 Attributes[ MetricTensor ] = Attributes[ ScalarProduct ] = {Orderless}
+(*
 FourVector/: -FourVector[ mom_, mu___ ] := FourVector[Expand[-mom], mu]
 FourVector[ 0, ___ ] = 0
+*)
 M$GenericPropagators = {
 	(* general fermion propagator: *)
   AnalyticalPropagator[External][ s F[i, mom] ] ==