I stopped working on the rifle back in Dec 07 because our clan didn't seam interested in UT3 sniper so I never created anything custom for it (a redirect didn't come until patch 1.2 in Feb 08).

If you want to check out a custom rifle look at the IK XARK.  There's a UPK file in there that you can use to test with:

http://forums.epicgames.com/showthread.php?t=589130

The soure code is not included but you set them in your weapon class:

DroppedPickupMesh=MESH_PATH_NAME
PickupFactoryMesh=MESH_PATH_NAME

Your 1P mesh is set like:

Mesh=MESH_PATH_NAME