CMMG 55DC70A Barrel Sub-Assembly 5.56x45mm NATO 16.10″ Black Nitride Finish 4140 Chromoly Steel Material Midlength with Medium Taper Profile for AR-15
Diamondback 556C16MF50B8R DB Barrel (M4 Contour) 5.56x45mm NATO 16″ Black Nitride 4150 Chrome Moly Vanadium Steel
Wilson Combat TR300RCPG16RT7 Match Grade Barrel 300 Blackout 16″ Stainless Bead Blasted Finish 416R Stainless Steel Material Pistol Length with Threading & 1:7″ Twist for AR-15