The HWS XPS-2 is the non night-vision version of EOTech's shortest and lightest HWS sight so far. The CR123 lithium battery configuration of the XPS-2 provides additional rail space, leaving more room for rear iron sights or magnifiers. Also offering water-resistant capability up to 10 feet, the XPS-2 is a great compact and lightweight option for the UNIT4 Training Rifle.