I have a brand new in the box Adams Arms AR-15 Carbine Piston Rifle that a guy at work wants to buy from me. My question is could you guys help place a fair value on it in todays current conditions. The rifle came just like this from Adams, wasn't put together. Adams Arms builds their rifles with the piston system and it has very good reviews. So, I need a fair value without ripping off my coworker. I don't need to sale it and don't think I should sell it for what I paid for it.