This is a used LWRCI M6-IC-SPR complete gas piston AR-15 upper chambered in 5.56 NATO. It features a 14.7-inch barrel with a 1:7 twist rate, a pinned and welded AAC blackout flash hider (making for a total length of 16 inches), and a picatinny rail system. This LWRCI upper is in good condition normal signs of use on the barrel, bolt carrier, and upper receiver. This LWRCI upper would be good for a custom AR-15 build. Buy online today!