Primary Arms SLx MicroPrism Straight Riser 1.93in Black. 93in 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. Specifications for Primary Arms SLx MicroPrism Straight Riser: Manufacturer: Primary Arms Color: Black Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Height: 1.93 in Condition: New Package Contents: Primary Arms SLx MicroPrism Straight Riser Primary Arms SLx MicroPrism Straight Riser 1.93in Black 210104