Strike Industries R.EX Riser - Low Profile Lightweight Riser for AR Platforms FDE One Size. EX Riser is a low profile lightweight riser for AR platforms. Set at the ideal height for co-witnessing while using the SI Reflex Exoskeleton mount with either A2 height or Sidewinder sights (without spacer) the REX Riser is versatile and provides and solid mounting platform. While optimized for use with the R.EX Mount the universal Picatinny pattern can be used with many other optics that can be mounted on picatinny sections. Specifications for Strike Industries R.EX Riser - Low Profile Lightweight Riser for AR Platforms: Manufacturer: Strike Industries Fabric/Material: 6061-T6 Aluminum/Steel Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Length: 2.09 in Height: 0.63 in Weight: 2 oz Condition: New Gun Rail: Picatinny Features of Strike Industries R.EX Riser - Low Profile Lightweight Riser for AR Platforms Low profile rail riser Lightweight 2 0z total installed cowitness height. Cowitness with A2 or Sidewinder Sight using R.EX Mount 3 picatinny slot sections Package Contents: Strike Industries R.EX Riser - Low Profile Lightweight Riser for AR Platforms 1x Riser Base 1x M5x30mm Cap Head Hex Screw 2x 10x3x.48mm spring 1x Clamp 1x Spacer 1x Riser rail 4x M3x6mm button head hex screw Strike Industries SI-REX-RISER-FDE: R.EX Riser - Low Profile Lightweight Riser for AR Platforms FDE One Size