Super lightweight carbon fiber outer barrel! Carbon fiber and CNC aluminum base and threaded end construction makes it as strong as normal outer at 75% less weight! CCW threads. Checkout my website, www.customairsoftbarrels.com for more pics / info! I have a few different lengths. All my barrels are made to last as long as you and have my guarantee that they will be badass forever or I'll fix it. Free shipping! I also have multiple other gun model barrels available! Ask/see my profile.