Tensioned barrels is not a new idea. Some have done with with rimfire guns with some success, but in the rimfire world, this idea has not taken off.. Reducing harmonic vibration of gun barrels is the goal we all want. The tensioned barrel that FX is using kinda replicates adding mass to a barrel to make it stiffer,.. In rimfires, they use heavy barrels with adjustable tuners. In this case, a complex barrel assembly starting with a thin soda straw barrel and adding tensioned carbon tubes is doing the same thing. I've always asked the question as to why no one wants to machine a heavy barrel, like an LW, and fit it to an FX rifle? No doubt, cost is the issue. But is a complex, multi part, barrel system the way to go? A steel liner with a carbon fiber outer tube can be a thermal problem since the coefficient of thermal expansion is different between steel and carbon fiber. So, will the POI shift during the day when you start off cool and then the sun heats everything up 30 or 40 degrees? I dunno. Anyway, kudos to Matt, Hein and everyone else for improving the airgun systems. I just hope this doesn't give some nutty politician any ideas about power limitations, like in the UK.