Yes, I mean the smg and yes, that's mostly what I had in mind too.
True Ogre might be faster if you get past the fuse but the normal NFAS mostly doesn't deal enough damage to have a faster ttk. It should need only 3stk but its damage is so inconsistent, that you often need about 5 to 7.
Might be more consistent after shotgun change though, let's see.