In the EUP 7.4 Update, Alex Ashfold added the empty holster model. If you want this to work, you will need a config line for the cop holster.ini file. I got this one from the faq of EUP. Made by Alex
[Ped:MP_M_FREEMODE_01]
FuncHolster=True
FuncIntim=True
FuncIntimMesh=7:8,7:7,7:6
7:8=7:2
7:1=7:3
[Ped:MP_F_FREEMODE_01]
FuncHolster=True
FuncIntim=True
FuncIntimMesh=7:8
7:8=7:2
7:1=7:3