The Proj_Swaps_1.rar file you have requested: Maps Levels Missions / Miscellaneous / O to P Titles / Projectile Swap - 4.09mb 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:
Here are just a bunch of projectile swaps by jwl12345. The pistol replaced by gravity rifle that shoots flames, AR shoots rockets, Plasma rifle shoots fuel rods and Shotgun shoots tank shells (like a nuke).