Check your mounts
Where is the mounts?
Make a point and name it "mountPoint" note the caps.And for where it fires out, name that point "muzzlePoint".
In milkshape?
Or blender.But yes, in your modeling program.
Modify the model to face the other way.
I can't find point only joint
You make a joint, and you NAME it mountPoint/muzzlePoint as explained above.
Ohhh OK I will try that.
That makes it sound like it won't work...Because that's the only way to do it...
I did exactly as you said