UMP 45
Installation: Go to Grand Theft Auto V\Mods\update\x64\dlcpacks\mpluxe\dlc.rpf\x64\models\cdimages\weapons.rpf\ and replace the files. Pratus paid for this!
Heng Li Feng UMP45 Gel Blaster (Black)
HK UMP 45 - Gel Blaster (V8) – Gel Ball Undercover
Umarex - VFC UMP 45 DX GBBR - Trigger Airsoft
H&K UMP Competition Series Airsoft AEG Rifle by Umarex (Color: Black), Airsoft Guns, Airsoft Electric Rifles - Airsoft Superstore
HK USC/UMP. 45 ACP cal. Carbine New in Case Conversion
The most powerful small arms. Part of 2. Submachine gun UMP45 chambered for .45 ACP
UMP9 - Heckler & Koch
Meet my UMP 45 with my newly unjailed Osprey 45! : r/guns
MP9 vs UMP-45: Which CS:GO SMG is better?
UMP-45 - Official Scum Wiki