I found this gun in a pawn shop today. The upper is what is stated in the header, but the lower is satin and made by safari arms. Is this a common thing to do, i mean put a colt upper on a safari frame? Seems to me that the colt frame would be the way to go. Would this combo lower or raise resale value? Wanna hear the real kicker? They have it tagged as an Ed Brown! Asking 800.00 out the door. Feedback please. Thanks.