V Seven Extreme Environment Gas Tube Mid Length Ionbond Finish EXT-MID GT. V Seven constructed these AR Gas Tubes from heat-treated Inconel a remarkably strong super alloy that performs even when under ultra-high firing schedules. For enhanced toughness the V Seven EXT Extreme Environment Gas Tube contains a DLC coating that amplifies its resistance to corrosion and wear. Take on any challenge in any setting by using the V Seven Extreme Environment Gas Tube for AR-15. Specifications for V Seven Extreme Environment Gas Tube: Manufacturer: V Seven Color: Black Finish: Ionbond (DLC) Fabric/Material: Inconel Gun Model: AR-15 Caliber: 5.56x45mm NATO Condition: New Features of V Seven Extreme Environment Gas Tube: Heat-treated Inconel construction Impervious to heat compared to a Mil-Spec gas tube Designed to function under super-high temperature firing schedules Eliminates the weak link in direct impingement gas systems 100percent corrosion resistant DLC black finish Pistol length weighs 14 grams Carbine length weighs 21 grams Mid-length weighs 26 grams Rifle length weighs 35 grams Lifetime Warranty Please note: gas tube must be installed in the gas block prior to seating the gas block to the barrel. EXT-gas tubes do not fit with Aero Precision Enhanced Upper Receivers (M4E1 & M5E1) or Seekins Precision SAR Handguards Package Contents: V Seven Extreme Environment Gas Tube What firearm models does the manufacturer say V Seven Extreme Environment Gas Tube is compatible with? The manufacturer says that V Seven Extreme Environment Gas Tube is compatible with AR-15V Seven EXT-MID GT: Extreme Environment Gas Tube Mid Length Ionbond Finish