GC_UPC AR-15/M16 NiB-X~ COATED UPPER RECEIVER $146.98 - show more like this Free shipping over $400 (Excludes Ammo) Gman Sport GC_UPC Ar-15/M16 Nib-X NIBXUFB 855899003041 $147.79 NIBXUFB show more like this Firearms $18.45, Free over $500 Shooting Surplus GC_UPC Wmd Guns Ar-15/M16 Nib-X® Coated Upper Receiver - Nib-X® Upper Receiver, Black $166.99 1-NIBXUFB show more like this $12.50 Brownells