GC_UPC Colt Mfg LE6921CK Upper Conversion Kit 223 Rem,5.56 NATO 14.50" $797.00 LE6921CK show more like this 14.95 TheGunDock.com GC_UPC Colt Mfg LE6921CK LE6921 223 Remington/5.56 NATO 14.5 in $807.68 LE6921CK show more like this lat rate starting at $11.99 Hinterland Outfitters