Spike's Tactical has produced what they believe is the best gas tube out on the market for the AR-15 rifle. The gas tube is made out of Mil-Spec 304 stainless steel with a Melonite coating for greater corrosion resistance, and lower reflection. Included is a split roll pin.
Specifications:

Type	Gas Tube
Model	AR-15
Dimensions
Size	Mid Length
Material	304 Stainless Steel
Action
Trigger
Safety
Thread Pattern
Finish	Black Melonite
Bolt Type
Hand
Hammer Type
Max Capacity