This is straight forward. If you bought a gun/attachment, you can sell them unless you would have unlocked them normally by now.
buy bfg as rank 12
ranks up to 34
He could now sell the BFG for the price he would buy it at rank 34.
Darkman_Bree This community is so divided.
There's the Haters, who hate on StyLiS for LMGs, shotguns, spawn algorithm, etc. BUT THEY STILL PLAY THE GAME.
Then there's the Players who literally play normally without whining about stuff that doesn't even deserved to be whined about.