These are Just a Few Gun Types (And Possible Models) That could Spice up the game:

1. Burst Weapons: (3 Round)
   Possible Models:
   -UMP45
   -FAMAS
   -M93R (Pistol)

2. Machine Pistol (Full-Auto)
   Possible Models:
   -Glock 18
   -Skorpion
   -UZI

3. Marksman Rifle (Like A Sniper, But It has a bigger mag, less Damage, and Is Semi-Automatic)
   Possible Models:
   -HK MSG-90
   -M14 DMR
   -FN-15 DMR

Heavy Pistol (Basically a Sniper-Pistol)
Possible Models:
-Desert Eagle
-44. Magnum (The Taurus, Not that Dinky Revolver)

That is all the Weapon Ideas That I Have, I hope you enjoyed!