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@Stiusso I have a solution that works for me : Put the weapons.meta file from Die Klatsche`s mod on your desktop , then open it with Word(I use win8 so for me its Wordpad) and replace these lines:
Theres a line AUDIO in weapons.meta its the first option i think
Change these : From mod author Suspect:
"For Carbine rifle, change whatever is in AUDIO option into AUDIO_ITEM_COMBATPISTOL
For Assault rifle change that option to AUDIO_ITEM_PISTOL
For Combat Mg change that option to AUDIO_ITEM_PISTOL50
For SMG change that option to AUDIO_ITEM_CARBINERIFLE
For Micro Smg change that option to AUDIO_ITEM_COMBATMG
For Advanced Rifle change that option to AUDIO_ITEM_HEAVYPISTOL (or PISTOLHEAVY i dont remember)"<-- HeavyPistol is the right one

As a little help:

<Item type="CWeaponInfo">
<Name>WEAPON_MICROSMG</Name>
<Model>w_sb_microsmg</Model>
<Audio>AUDIO_ITEM_MICROSMG</Audio> <------The line you have to edit . dont touch anything else.
<Slot>SLOT_MICROSMG</Slot>
<DamageType>BULLET</DamageType>
<Explosion>
<Default>DONTCARE</Default>
<HitCar>DONTCARE</HitCar>
<HitTruck>DONTCARE</HitTruck>
<HitBike>DONTCARE</HitBike>
<HitBoat>DONTCARE</HitBoat>
<HitPlane>DONTCARE</HitPlane>
</Explosion>
<FireType>INSTANT_HIT</FireType>
<WheelSlot>WHEEL_SMG</WheelSlot>
<Group>GROUP_SMG</Group>
<AmmoInfo ref="AMMO_SMG" />
<AimingInfo ref="SMG_2H_BASE_STRAFE" />
<ClipSize value="16" />
<AccuracySpread value="4.000000" />
<AccurateModeAccuracyModifier value="0.500000" />
<RunAndGunAccuracyModifier value="2.000000" />
<RunAndGunAccuracyMinOverride value="-1.000000" />
<RecoilAccuracyMax value="0.500000" />
<RecoilErrorTime value="1.500000" />
<RecoilRecoveryRate value="1.000000" />
<RecoilAccuracyToAllowHeadShotAI value="1000.000000" />
<MinHeadShotDistanceAI value="1000.000000" />
<MaxHeadShotDistanceAI value="1000.000000" />
<HeadShotDamageModifierAI value="1000.000000" />
<RecoilAccuracyToAllowHeadShotPlayer value="0.175000" />
<MinHeadShotDistancePlayer value="5.000000" />
<MaxHeadShotDistancePlayer value="40.000000" />
<HeadShotDamageModifierPlayer value="18.000000" />
<Damage value="21.000000" />
<DamageTime value="0.000000" />
<DamageTimeInVehicle value="0.000000" />
<DamageTimeInVehicleHeadShot value="0.000000" />
<HitLimbsDamageModifier value="0.500000" />
<NetworkHitLimbsDamageModifier value="0.800000" />
<LightlyArmouredDamageModifier value="0.750000" />
<Force value="40.000000" />
<ForceHitPed value="120.000000" />
<ForceHitVehicle value="750.000000" />
<ForceHitFlyingHeli value="750.000000" />
<OverrideForces>
<Item>
<BoneTag>BONETAG_HEAD</BoneTag>
<ForceFront value="80.000000" />
<ForceBack value="90.000000" />
</Item>
<Item>
<BoneTag>BONETAG_NECK</BoneTag>
<ForceFront value="40.000000" />
<ForceBack value="90.000000" />
</Item>
<Item>
<BoneTag>BONETAG_L_THIGH</BoneTag>
<ForceFront value="40.000000" />
<ForceBack value="1.000000" />
</Item>
<Item>
<BoneTag>BONETAG_R_THIGH</BoneTag>
<ForceFront value="40.000000" />
<ForceBack value="1.000000" />
</Item>
<Item>
<BoneTag>BONETAG_L_CALF</BoneTag>
<ForceFront value="70.000000" />
<ForceBack value="80.000000" />
</Item>
<Item>
<BoneTag>BONETAG_R_CALF</BoneTag>
<ForceFront value="60.000000" />
<ForceBack value="100.000000" />
</Item>
</OverrideForces>
<ForceMaxStrengthMult value="1.000000" />
<ForceFalloffRangeStart value="0.000000" />
<ForceFalloffRangeEnd value="50.000000" />
<ForceFalloffMin value="1.000000" />
<ProjectileForce value="0.000000" />
<FragImpulse value="500.000000" />
<Penetration value="0.010000" />
<VerticalLaunchAdjustment value="0.000000" />
<DropForwardVelocity value="0.000000" />
<Speed value="2000.000000" />
<BulletsInBatch value="1" />
<BatchSpread value="0.000000" />
<ReloadTimeMP value="-1.000000" />
<ReloadTimeSP value="-1.000000" />
<VehicleReloadTime value="0.750000" />
<AnimReloadRate value="1.000000" />
<BulletsPerAnimLoop value="1" />
<TimeBetweenShots value="0.100000" />
<TimeLeftBetweenShotsWhereShouldFireIsCached value="-1.000000" />
<SpinUpTime value="0.000000" />
<SpinTime value="0.000000" />
<SpinDownTime value="0.000000" />
<AlternateWaitTime value="-1.000000" />
<BulletBendingNearRadius value="0.000000" />
<BulletBendingFarRadius value="0.750000" />
<BulletBendingZoomedRadius value="0.375000" />
<FirstPersonBulletBendingNearRadius value="0.000000" />
<FirstPersonBulletBendingFarRadius value="0.750000" />
<FirstPersonBulletBendingZoomedRadius value="0.375000" />
<Fx>
<EffectGroup>WEAPON_EFFECT_GROUP_SMG</EffectGroup>
<FlashFx>muz_smg</FlashFx>
<FlashFxAlt>muz_alternate_star</FlashFxAlt>
<FlashFxFP>muz_smg_fp</FlashFxFP>
<FlashFxAltFP />
<MuzzleSmokeFx>muz_smoking_barrel</MuzzleSmokeFx>
<MuzzleSmokeFxFP>muz_smoking_barrel_fp</MuzzleSmokeFxFP>
<MuzzleSmokeFxMinLevel value="0.300000" />
<MuzzleSmokeFxIncPerShot value="0.100000" />
<MuzzleSmokeFxDecPerSec value="0.250000" />
<ShellFx>eject_auto</ShellFx>
<ShellFxFP>eject_smg_fp</ShellFxFP>
<TracerFx>bullet_tracer</TracerFx>
<PedDamageHash>BulletSmall</PedDamageHash>
<TracerFxChanceSP value="0.150000" />
<TracerFxChanceMP value="0.750000" />
<FlashFxChanceSP value="1.000000" />
<FlashFxChanceMP value="1.000000" />
<FlashFxAltChance value="0.200000" />
<FlashFxScale value="1.000000" />
<FlashFxLightEnabled value="true" />
<FlashFxLightCastsShadows value="false" />
<FlashFxLightOffsetDist value="0.000000" />
<FlashFxLightRGBAMin x="255.000000" y="93.000000" z="25.000000" />
<FlashFxLightRGBAMax x="255.000000" y="100.000000" z="50.000000" />
<FlashFxLightIntensityMinMax x="1.000000" y="2.000000" />
<FlashFxLightRangeMinMax x="2.00000" y="2.500000" />
<FlashFxLightFalloffMinMax x="1024.000000" y="1536.000000" />
<GroundDisturbFxEnabled value="false" />
<GroundDisturbFxDist value="5.000000" />
<GroundDisturbFxNameDefault />
<GroundDisturbFxNameSand />
<GroundDisturbFxNameDirt />
<GroundDisturbFxNameWater />
<GroundDisturbFxNameFoliage />
</Fx>
<InitialRumbleDuration value="86" />
<InitialRumbleIntensity value="0.366000" />
<InitialRumbleIntensityTrigger value="0.950000" />
<RumbleDuration value="96" />
<RumbleIntensity value="0.100000" />
<RumbleIntensityTrigger value="0.800000" />
<RumbleDamageIntensity value="1.000000" />
<InitialRumbleDurationFps value="106" />
<InitialRumbleIntensityFps value="0.400000" />
<RumbleDurationFps value="95" />
<RumbleIntensityFps value="0.600000" />
<NetworkPlayerDamageModifier value="1.000000" />
<NetworkPedDamageModifier value="1.000000" />
<NetworkHeadShotPlayerDamageModifier value="2.500000" />
<LockOnRange value="55.000000" />
<WeaponRange value="120.000000" />
<BulletDirectionOffsetInDegrees value="0.000000" />
<AiSoundRange value="-1.000000" />
<AiPotentialBlastEventRange value="-1.000000" />
<DamageFallOffRangeMin value="40.000000" />
<DamageFallOffRangeMax value="120.000000" />
<DamageFallOffModifier value="0.300000" />
<VehicleWeaponHash />
<DefaultCameraHash>DEFAULT_THIRD_PERSON_PED_AIM_CAMERA</DefaultCameraHash>
<CoverCameraHash>DEFAULT_THIRD_PERSON_PED_AIM_IN_COVER_CAMERA</CoverCameraHash>
<CoverReadyToFireCameraHash />
<RunAndGunCameraHash>DEFAULT_THIRD_PERSON_PED_RUN_AND_GUN_CAMERA</RunAndGunCameraHash>
<CinematicShootingCameraHash>DEFAULT_THIRD_PERSON_PED_CINEMATIC_SHOOTING_CAMERA</CinematicShootingCameraHash>
<AlternativeOrScopedCameraHash />
<RunAndGunAlternativeOrScopedCameraHash />
<CinematicShootingAlternativeOrScopedCameraHash />
<CameraFov value="45.000000" />
<FirstPersonScopeFov value="35.00000"/>
<FirstPersonScopeAttachmentFov value="30.00000"/>
<FirstPersonRNGOffset x="0.000000" y="0.000000" z="0.025000" />
<FirstPersonRNGRotationOffset x="0.000000" y="0.000000" z="2.000000" />
<FirstPersonLTOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonLTRotationOffset x="0.000000" y="0.000000" z="0.000000" />
<FirstPersonScopeOffset x="0.00000" y="-0.0400" z="0.00000" />
<FirstPersonScopeAttachmentOffset x="0.0010" y="-0.02000" z="-0.0160" />
<FirstPersonScopeRotationOffset x="0.0000" y="0.0000" z="0.2000" />
<FirstPersonScopeAttachmentRotationOffset x="0.00000" y="0.00000" z="0.2000" />
<FirstPersonAsThirdPersonIdleOffset x="0.075" y="0.00000" z="0.02500000" />
<FirstPersonAsThirdPersonRNGOffset x="0.000" y="0.000000" z="-0.15" />
<FirstPersonAsThirdPersonLTOffset x="0.0250" y="0.000000" z="-0.1" />
<FirstPersonAsThirdPersonScopeOffset x="0.025000" y="0.100000" z="-0.12000" />
<FirstPersonAsThirdPersonWeaponBlockedOffset x="-0.0250000" y="0.050000" z="-0.050000" />
<FirstPersonDofSubjectMagnificationPowerFactorNear value="1.025000" />
<FirstPersonDofMaxNearInFocusDistance value="0.000000" />
<FirstPersonDofMaxNearInFocusDistanceBlendLevel value="0.300000" />
<ZoomFactorForAccurateMode value="1.300000" />
<RecoilShakeHash>SMG_RECOIL_SHAKE</RecoilShakeHash>
<RecoilShakeHashFirstPerson>FPS_SMG_RECOIL_SHAKE</RecoilShakeHashFirstPerson>
<AccuracyOffsetShakeHash>DEFAULT_THIRD_PERSON_ACCURACY_OFFSET_SHAKE</AccuracyOffsetShakeHash>
<MinTimeBetweenRecoilShakes value="0" />
<RecoilShakeAmplitude value="0.333000" />
<ExplosionShakeAmplitude value="-1.000000" />
<IkRecoilDisplacement value="0.0" />
<IkRecoilDisplacementScope value="0.001" />
<IkRecoilDisplacementScaleBackward value="1.0" />
<IkRecoilDisplacementScaleVertical value="0.4" />
<ReticuleHudPosition x="0.000000" y="0.000000" />
<AimOffsetMin x="0.260000" y="0.125000" z="0.300000" />
<AimProbeLengthMin value="0.300000" />
<AimOffsetMax x="0.250000" y="-0.255000" z="0.325000" />
<AimProbeLengthMax value="0.285000" />
<AimOffsetMinFPSIdle x="0.178000" y="0.392000" z="0.135000" />
<AimOffsetMedFPSIdle x="0.169000" y="0.312000" z="0.420000" />
<AimOffsetMaxFPSIdle x="0.187000" y="0.064000" z="0.649000" />
<AimOffsetEndPosMinFPSIdle x="0.208000" y="0.700000" z="0.003000" />
<AimOffsetEndPosMedFPSIdle x="0.203000" y="0.604000" z="0.553000" />
<AimOffsetEndPosMaxFPSIdle x="0.20700" y="-0.040000" z="0.942000" />
<AimOffsetMinFPSLT x="0.009000" y="0.334000" z="0.555000" />
<AimOffsetMaxFPSLT x="0.062000" y="-0.164000" z="0.588000" />
<AimOffsetMinFPSRNG x="0.114000" y="0.390000" z="0.485000" />
<AimOffsetMaxFPSRNG x="0.113000" y="-0.263000" z="0.586000" />
<AimOffsetMinFPSScope x="0.009000" y="0.421000" z="0.462000" />
<AimOffsetMaxFPSScope x="0.037000" y="-0.224000" z="0.639000" />
<TorsoAimOffset x="-1.000000" y="0.550000" />
<TorsoCrouchedAimOffset x="0.200000" y="0.100000" />
<LeftHandIkOffset x="0.000000" y="0.000000" z="0.000000" />
<ReticuleMinSizeStanding value="0.750000" />
<ReticuleMinSizeCrouched value="0.600000" />
<ReticuleScale value="0.300000" />
<ReticuleStyleHash>WEAPONTYPE_SMG</ReticuleStyleHash>
<FirstPersonReticuleStyleHash />
<PickupHash>PICKUP_WEAPON_MICROSMG</PickupHash>
<MPPickupHash>PICKUP_AMMO_BULLET_MP</MPPickupHash>
<HumanNameHash>WT_SMG_MCR</HumanNameHash>
<MovementModeConditionalIdle>MMI_1Handed</MovementModeConditionalIdle>
<StatName>MICROSMG</StatName>
<KnockdownCount value="-1" />
<KillshotImpulseScale value="1.000000" />
<NmShotTuningSet>AutomaticSMG</NmShotTuningSet>
<AttachPoints>
<Item>
<AttachBone>WAPClip</AttachBone>
<Components>
<Item>
<Name>COMPONENT_MICROSMG_CLIP_01</Name>
<Default value="true" />
</Item>
<Item>
<Name>COMPONENT_MICROSMG_CLIP_02</Name>
<Default value="false" />
</Item>
</Components>
</Item>
<Item>
<AttachBone>WAPFlshLasr</AttachBone>
<Components>
<Item>
<Name>COMPONENT_AT_PI_FLSH</Name>
<Default value="false" />
</Item>
</Components>
</Item>
<Item>
<AttachBone>WAPScop</AttachBone>
<Components>
<Item>
<Name>COMPONENT_AT_SCOPE_MACRO</Name>
<Default value="false" />
</Item>
</Components>
</Item>
<Item>
<AttachBone>WAPSupp</AttachBone>
<Components>
<Item>
<Name>COMPONENT_AT_AR_SUPP_02</Name>
<Default value="false" />
</Item>
</Components>
</Item>
<Item>
<AttachBone>gun_root</AttachBone>
<Components>
<Item>
<Name>COMPONENT_MICROSMG_VARMOD_LUXE</Name>
<Default value="false" />
</Item>
</Components>
</Item>
</AttachPoints>
<GunFeedBone />
<TargetSequenceGroup />
<WeaponFlags>CarriedInHand Automatic Gun CanLockonOnFoot CanLockonInVehicle CanFreeAim AnimReload AnimCrouchFire TreatAsOneHandedInCover UsableOnFoot UsableInCover AllowEarlyExitFromFireAnimAfterBulletFired NoLeftHandIKWhenBlocked AllowCloseQuarterKills HasLowCoverReloads HasLowCoverSwaps UseLeftHandIkWhenAiming QuitTransitionToIdleIntroOnWeaponChange DisableLeftHandIkWhenOnFoot UseFPSAimIK UseFPSSecondaryMotion UseAlternateFPDrivebyClipset FPSOnlyExitFireAnimAfterRecoilEnds</WeaponFlags>
<TintSpecValues ref="TINT_DEFAULT" />
<FiringPatternAliases ref="FIRING_PATTERN_SMG" />
<ReloadUpperBodyFixupExpressionData ref="default" />
<AmmoDiminishingRate value="3" />
<AimingBreathingAdditiveWeight value="1.000000" />
<FiringBreathingAdditiveWeight value="1.000000" />
<StealthAimingBreathingAdditiveWeight value="1.000000" />
<StealthFiringBreathingAdditiveWeight value="1.000000" />
<AimingLeanAdditiveWeight value="1.000000" />
<FiringLeanAdditiveWeight value="1.000000" />
<StealthAimingLeanAdditiveWeight value="1.000000" />
<StealthFiringLeanAdditiveWeight value="1.000000" />
<ExpandPedCapsuleRadius value="0.000000" />
<AudioCollisionHash />
<HudDamage value="21" />
<HudSpeed value="60" />
<HudCapacity value="20" />
<HudAccuracy value="30" />
<HudRange value="25" />
Hope this was helpful.
sry if not . . .