Many tactical rifles have ambidextrous features like left- and right-side safeties, magazine releases and bolt releases, but these other rifles can’t be adjusted to change the direction in which spent casings are ejected. The ARX100 can be changed from right- to left-hand ejection in less than a minute. Just pull the bolt back and push the charging handle over to the left side. Then press a button on the side of the receiver to switch ejection from the right side to the left. Changing ejection is possible because the rifle has dual extractors and no ejector. When the button is pressed, one of the extractors is locked in place and becomes the ejector!