Ok, so despite my best efforts on penny pinching, i decided against every can i was considering and went for the AAC m4-2k which was the one i really wanted anyway. I ordered it at my dealer today. I was wondering if anyone knows of anywhere that has those QD flash hiders that they use in-stock. I know it comes w/ one, but i will be getting another upper for my ar sometime soon and figure ill just use the extra on that one. I would really like to get one now or soon so i can have an upper w/ one installed when the can comes round the mountain. Also, anyone know if aac requires the flash hider to be installed by a "qualified gunsmith?" Thanks and good day all.