Faxon Firearms FX5500: The Faxon Ion Rifle is the most affordable production ultralight AR15 on the market. Weighing in at just under 5 lbs, the Ion Ultralight AR15 is the perfect choice for any customer looking to step into the competition world, or for those who just enjoy the soft recoil of a finely tuned lightweight rifle. As part of Faxon\'s Summit Line, the Ion comes from the factory with a whole slew of out-of-the-box upgrades, including a tuned gas system, Gunner lightweight bolt carrier group, ambi charging handle & safety selector, Hiperfire Edtdm trigger, and more!