I bought this ar with a psa lower no clue what upper last week from a pawn shop and chose it solely because the chambering handle looked funny I’m new to guns never seen one that has the chambering handle on the barrel and left side don’t have many good pictures I can post more after work me and my brother in law opened it up and only found a patent pending sticker and the number 15 stamped into the upper the barrel is made in 223 wylde no branding or anything to be found on barrel any help would be appreciated