With the new NGSW of the U.S. Army also comes with a new optic. Garand Thumb tries the XM-157 made by Vortex Optics selected to be paired with the NGSW being produced by SIG Sauer... "The US Army has selected the XM-157 to work along side many new weapon systems including the X-M5 NGSW. This new optic from Vortex has a feature that ranges and calculates your exact hold to achieve first round impacts. The hold is displayed within the optic.