PBarrelLength and SBarrelLength are useful.
Read my
tutorial about setting the FireFLH and you'll understand what they do.
I've never used BarrelOffset, but i'm quite sure it can be useful too. E.g. if you want a barrel placed far to the front, i'm not sure if this can be done well with the hva, since the rotation point will be in the centre which will make the barrel rotate not around the visible start of the barrel
This post has been edited by Lin Kuei Ominae: Sep 5 2010, 10:13 PM