AERO PRECISION AR-15 Assembled Upper Receiver 16 Carbine Length w/ FSB - $239.94 shipped w/coupon "SRF"
https://www.brownells.com/rifle-parts/receiver-parts/receivers/upper-receivers/ar-15-assembled-upper-receiver-16-carbine-length-w-fsb-sku100025501-109489-207142.aspx?avad=avant&aid=35987&cm_mmc=affiliate-_-Itwine-_-Avantlink-_-Custom+Link&utm_medium=affiliate&utm_source=Avantlink&utm_content=NA&utm_campaign=Itwine
https://www.brownells.com/rifle-parts/receiver-parts/receivers/upper-receivers/ar-15-assembled-upper-receiver-16-carbine-length-w-fsb-sku100025501-109489-207142.aspx?avad=avant&aid=35987&cm_mmc=affiliate-_-Itwine-_-Avantlink-_-Custom+Link&utm_medium=affiliate&utm_source=Avantlink&utm_content=NA&utm_campaign=Itwine