Duping method 0.54 update

Ok so this worked once with a protector case and got more mags for my m4.
So then we tryed to do it again over and over like 3-5 times and it dident work it kept just giving the protector case to my friend and i dident have it.
What am i doing wrong?
What i did was i filled up my inv with shit and then put the case in my hands and then i would bandage and it would drop, he would pick it up in his hands also and then we would both logout? so what am i doing wrong? is someone meant to log out first or something.
Someone help me please.
Like am i also meant to log out before i finsh bandaging or after and the little details please.

on 0.55 you are still able to dupe weapons! just to let you guys know

It works in 0.55??

Well, I tried it with protector case and i saw it in His hands then the protector case just teleported back to my hand.

yep it still works in .55 tried it out today

How in the heck does it work for you??