ceramic exterior "Weathershield" coating that fits TC Encore and Pro Hunter frames. Many shooters prefer the metallurgical characteristics of chromoly (blue) steel to stainless steel. Weathershield barrels combine exterior rust protection with a chromoly rifle bore... The best of both worlds.
According to TC Arms sight the new Weathershield coating on its barrels and frames is 50 times more corrosion resistant than stainless steel.
According to TC customer service underneath the weather shield it is the same barrel as a blued barrel with the coating applied. And judging from the prices it must be a less expensive application for TC because WS prices are lower.

David, this rifle incorporates a matte Silver corrosion-resistant Weather Shield coating to help shrug off the harshest weather that Mother Nature can throw at it.