In any mode the weapons despawn, after you either die or drop a weapon to pick up a weapon for a short period, way to quickly to even make it back even across a small map to pick up the weapon again. Many of my friends and I believe that the despawning of the weapons should be increased to at least a couple of minutes in multi-player and since you don't go up against other people, completely removed in the Spartan Ops and Campaign. Thanks for reading and I hope to see this applied in the future.
Tw0aCeS