In a recent past suggestion, I wanted the two shotguns to be more different from each other than what they are right now. But one guy who commented mentioned if the game could add in Combat Shotguns; I'm not too much into the idea, but this can be an opprotunity to change up the weaponry for INS:S farther than what NWI has does before.
I have some ideas on what Combat Shotguns can be implemented in INS:S. Nothing too drastic that could be overpowered in INS:S:
Security:
SPAS-12 (Famous Combat Shotgun in popular media/video games that can do Pump or Semi-Auto firemodes)
SPAS-15 (Lesser-known Combat Shotgun that is like the SPAS-12, but can be loaded with a Magazine)
M-1014 (Standard Combat Shotgun for the U.S. Armed Forces)
M-1208 (M-1212/M-1216) (Unique gun mechanism to twist magazine to load more shells)
STRIKER (South African Combat Shotgun. High capacity with the built-in drum mag. Long time to reload though)
Insurgent:
Any DOUBLE-BARREL SHOTGUN (IMO, they are technically Semi-Auto. They can have a special ability to fire both shells at the same time for a powerful attack, but with higher recoil and less accuracy)
MTS-255 (Russian Semi-Auto shotgun with a revolving cylinder magazine like a revolver. Can have the modification of a fast shell loader like revolver speed loaders)
SAIGA-12 (Russian Combat Shotgun loaded with magazines. Can also go Full-Auto and have a lot of opprotunities to modify, but only loaded with small-capacity magazines)
VEPR-12 (Essentially like the SAIGA-12, but maybe easier to apply with name licensing?)