GC_UPC Sharps Bros. 16in AR15/M4 Complete Upper Receiver, 5.56/.223 Cal, 15in Handguard, Mid Length, 1-7 Twist Rate, 1/2x28 TPI, Black Nitride, SBBU01 $859.99 SBBU01 show more like this Free Shipping on most orders over $49 Optics Planet