The Primary Arms MicroPrism 1.93" Straight Riser is an optional accessory for your favorite Primary Arms SLx MicroPrism Optic System.When used with the factory MicroPrism mounts, this riser will bring the centerline height of your MicroPrism to 1.93 inches, which allows for a more 'heads up'shooting position. Many believe this height to be faster and more comfortable than traditional optic heights, especially when used in conjunction with night vision devices or respiration/CBRN gear.This riser features the same reliable materials and construction as your factory risers and mounting equipment, and it comes backed with a lifetime warranty. CompatibilityPrimary Arms MicroPrismTrijicon Mini-ACOG