The a30.rar file you have requested: Maps Levels Missions / Shadow's Assult Rifle beta 0.3 - 13.6mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Halo, visit Halo2.filefront.com This is only a beta and I haven't added the scope and replacement textures yet. The mod appears on the second level.