C7 is just longer than C8 and thats about it. And yes longer rifles tend to be a pain in CQC because your weapon gets lowered.

In-game, the C7 and C8 have identical recoil and handling characteristics as the full auto M4 (the one without the foregrip)

iirc C7 has lower recoil but  everybody is going to see your barrel poking thorugh wall/window before you get outof/into a building.

In game it feels like it has less recoil and easier handling

Edit: Oh sorry I totally misread this as you asking the difference between the CC's and the M4

Is there a difference between the C8 and C7 for the CAF? Logically I would think the C7 has better ballistics, but how is it in game?

Canadian Rifle Difference