My friend had died so I tried carrying his gun for him, I had my SKS on my back and his M4 in my hands and carried it back to where he respawned. This has become the norm whenever one of us dies and we want to save the other persons weapons.
One time something came up and my friend had to log out while carrying my gun with his gun on his back, he logged in front of me and the gun in his hands dropped on the ground, I picked it up and when he logged in he still had the gun in his hands AND the gun on his back. We have tried it a few times and it always seems to work.