Cry Havoc Tactical 223 Two Pin QRB Barrel Locking Plate Kit - Rifle Gas Tube. 985in and Free Float Hand Guards with a maximum width of 2.0in Also the QRB will add 1.5in to the length of your free floating hand guard. For Caliber or Barrel Length Change - Includes Barrel Plate and Gas Tube. The 2-Pin option is the Military Model Currently in use by the United States Air Force. Specifications for Cry Havoc Tactical 223 Two Pin QRB Barrel Locking Plate Kits: Manufacturer: Cry Havoc Tactical Gun Make: AR Platform Gun Model: AR-15 Color: Black Condition: New Projectile Caliber: .223 Caliber Package Contents: Cry Havoc Tactical 223 Two Pin QRB Barrel Locking Plate Kits Barrel Plate Gas Tube Cry Havoc Tactical 793888120617: 223 Two Pin QRB Barrel Locking Plate Kit - Rifle Gas Tube