MP7 as for me is one of the coolest weapons, and in GTA 4 it will look great.
Download and surprise yourself.
Replaces: Micro Uzi
Installation: • Make copies of the replaced files • Select the desired model • Open with SparkIV, or Open IV and replace w_uzi.wdr and w_uzi.wtd in C: ... Grand Theft Auto IV/pc/models/cdimages/weapons.img • Save and rebuild the archive.