So yeah, the Service Weapon, AKA the Director's Gun from Control.

It's originally ported by Red Menace on the SFM workshop, I just ported it to Gmod, and I will take down if needed.

You need the Advanced Bone Tool to edit some parts of the gun.

SFM version -> https://steamcommunity.com/sharedfiles/filedetails/?id=1952624693

Credits :
Remedy Entertainment - Control
Smug Bastard - File Extraction and Material work
volfin - File Extraction Tools
Red Menace - Porting to SFM
NeoLin - Porting to Gmod