I have this freshly built AR-15 Upper Receiver [Lower Receiver NOT INCLUDED].  It's a milspec Upper Receiver with full auto BCG, a Ballistic Advantage 16" 5.56/.223 barrel, birdcage flashhide, MLoc handguard, and Spikes extended latch charging handle.  I've put 30 rounds through it to function test it, and it fires flawlessly.  I have also added an Eotech 552 clone, vertical foregrip with deployable bi-pods, and a laser mounted on the left-hand side.  Asking $600.00 or will consider any reasonable trade offers.