hi,
when enemy is dead he weapon must be in on the ground. Problem is because Is on the Air?
How are you attaching the weapon? What are you performing to cause the character to be on the ground - animation? Physics?
Weapons should be spawned and attached to the character.
If the weapon (actor) is attached to the character (socket), then it should remain socketed on player death/ragdoll regardless of animation or physics.
If the weapon is supposed to be released by the player and dropped, then you detach the weapon and then simulate physics on the weapon actor.