Oh well, it's not a bug in the sense of a something that's inherently broken, but it still bugs me...
The models for the Avalanche Mk1 and Mk2 seem to be swapped - the Mk1 shows a third hardpoint (already fitted with a non-existent gun), while the Mk2 (which actually has the third hardpoint) only has what looks like a black scorchmark in its place.
Version 0.8.4c
Yup, it's a bug :)
We have fixed it already in the new version.