They should add an M1014 for security and a Spas-12 for insurgents, since there aren't semi auto shotguns in the game yet, these 2 would be fitting and could probably be balanced
Franchi SPAS-12 Semi-Automatic/Slide Action Shotgun with Folding | Rock Island Auction
FIE Executive Email | The SPAS 12 Project
SPAS-12 Shotgun - YouTube
SKB 3I-4214-5B-L Waterproof Plastic 42.5" Case for Franchi SPAS-12 Semi Auto Shotgun | SHOTGUN-CASE-59
GunSpot.com | Gun Auctions | Buy Guns Online
Franchi SPAS 12 shotgun, the legend | all4shooters
SPAS-12 - WoD Gotham
THE SPAS-12, The World's Most ICONIC Shotgun - YouTube
I'd love to see the Spas-12 return from MW2 : r/ModernWarfareII