I believe the -2a removed the cannons to save weight, but still had the mounts, the ports, and the chutes. It's not like they gunport and ejection chute would be covered, they just pulled the gun out and removed the ammo canisters.
Did we not have this skin in AH1 once? Some time ago, perhaps? I seem to recall the white nose but can't remember the last time I ever flew with it.