Atlas Custom Works
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Atlas Custom Works' 8.8 inch carbine length gas tube replaces a bent or missing one on M4 and M16 pattern AEGs. On a real AR it carries propellant gas back to cycle the action, but on an AEG it's cosmetic, sitting under the handguard so the build is complete. It's made for carbine length gas systems, which is the most common on airsoft M4s, though it's worth measuring your own before you order. It comes in metal.