XTRAXN- A new type of rifle chamber flutes? "In an industry full of hype and less-than-useful gadgets, every once in a while there is a breakthrough that works. While the fine-details of XTRAXN™ Technology are close-hold, we will say that this evolutionary process results in higher-reliability with a wider range of ammo and operating conditions. Simply put, we just made one of the best guns in the world better! So, what is it? The process is not a coating or a lubricant. What we can tell you is - XTRAXN™ Technology provides excellent chamber release properties, gives longer life to the extractor components, and makes the entire operating system run smoother. XTRAXN™ is a proprietary chamber feature added to reduce frictional forces caused by pressure-expanded cartridge cases bearing against chamber walls. Facilitates reliable extraction through a wide range of temperature / chamber pressure extremes. XTRAXN extends extractor life, while having no effect on the firearm's accuracy. All this, and it dovetails well with the OBR's world-famous accuracy. If you have a PredatAR and OBR rifle on order...don't worry, you'll be one of the first to get this. Going forward, all LaRue PredatAR and OBR rifles will include XTRAXN™, without an increase in cost during this introduction. About LaRue Tactical Located in Leander, Texas, "LaRue" is synonymous world-wide with auto-resetting sniper targets and quick-detachable mounting systems for every weapon-mounted optic, laser and night-vision device used by our Nation’s Warfighters." http://www.ar15.com/forums/t_6_42/366439_Cases_fired_out_of_a_LaRue_OBR_sizing_really_hard.html