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Install file accordingly: [storage drive]\Program Files (x86)\Steam\steamapps\common\Ground Branch\GroundBranch\Content\GroundBranch\Inventpermory\PrimaryFirearm\M4
over all else, it's important that you install this mod with a clean slate. Go to steam verify the files and wipe away any prior mod replacing the m4 sopmod. It should help you install this (car-15) mod without further issues when going to apply the bp edit. Carry handle rail is functional, but not the sights itself. probably not possible with the current state of modding.
(must do this to get carry handle rail functional) ModernLancer BP tool required:
GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+BottomRail_GEN_VARIABLE+1+RelativeLocation+0+22+3.2;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RearSightRail_GEN_VARIABLE+1+RelativeLocation+0+5+13.8;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+BottomRail_GEN_VARIABLE+0+RecoilSlots+23;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+TopRail_GEN_VARIABLE+0+RecoilSlots+0;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RearSightRail_GEN_VARIABLE+0+RecoilSlots+15;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+LeftRail_GEN_VARIABLE+0+RecoilSlots+0;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RightRail_GEN_VARIABLE+0+RecoilSlots+0
Alternate
GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+BottomRail_GEN_VARIABLE+1+RelativeLocation+0+22+3,2;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RearSightRail_GEN_VARIABLE+1+RelativeLocation+0+5+13,8;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+BottomRail_GEN_VARIABLE+0+RecoilSlots+23;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+TopRail_GEN_VARIABLE+0+RecoilSlots+0;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RearSightRail_GEN_VARIABLE+0+RecoilSlots+15;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+LeftRail_GEN_VARIABLE+0+RecoilSlots+0;GroundBranch\Content\GroundBranch\Inventory\PrimaryFirearm\M4\BP_M4_A1.uasset+RightRail_GEN_VARIABLE+0+RecoilSlots+0