It's useless, if I understand correctly, you first put NON-augnamented weapon to the trade, then you augnament it, and press the ok button on the trade... Is that correct? I mean it's useless 'cause you only want to trade a weapon, and you must use your extra LS and gamestones just for other to have augnamented gun with rondom augnament(mabe you are lucky and augnament is empower 10lv on AM,- mabe not)? xD
Anyway I tryed it and it's not working, the trade window disappear after augnamentation.