If you plan to be very very sneaky, the Small Magazine for the combat rifle is added, makes it lighter and adds better handling traits. So i did not bothered to make a separate Drum Magazine for the combat rifle, but i could not find it on Nexus Mods, so ill upload it here, additional credits for Extort713.

But there was this mod already called “Drum Magazine” for combat rifles. In which previously the Shotgun did not have the Large, while the Rifle did not have the small. Giving both the Small,Medium,Large and Drum magazine. The combat shotgun uses default “Long Barrel” as the carbine barrel, but the new Long Barrel uses the Long Barrel of the Combat Rifle, and it’s ultra tight.

The additional Modifications are Carbine Barrels for the Combat Rifle and Combat Shotgun. The other mods are renamed such as “Short” with “Stub” barrel. It adds additional modification from the Combat Shotgun and Combat Rifle onto one another. Have you ever noticed how the Combat Rifle and Combat Shotgun seems to look exactly like one another? Well, that’s because they were supposed to be combined together - looking at the model files with almost the same directories.