I'm putting up for sale my AR-15 300 blackout rifle. It has a PSA upper 16'' barrel, Anderson lower and all magpul accesories w/ mlok rail. It's a great gun but I'm looking to build a AR-10 and already have a 300 pistol. Looking for $850 or willing to trade for a 5.56 AR-15 or a AK may add cash for the right trade.