MOh uses version 4 SKD file type for weapons
SH uses version 5 they file types were changed late in the build to stop would be "hackers" creating a milkshape plugins so we could import new weapons.
Anyway you can create new weapons but for the moment you cant animate a reload sequence so if you have an Enfiled model you can import it as an SKB but there wont be a reload sequence for it YET.
I imagine soon there will be anim exported (SKD files combined with SKC)
Keep checking TMT for updates to the molkshape plugins.
If you wanted to port over a weapon from SH to MOH the version 4 and 5 SKD is there to stop you and also with maps moh = version 19 BSP ,Sh = version 21 BSP.