A.R.M.S. Low Profile Flip Up Rear Sight Same - Plane Dual Aperture

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A.R.M.S. Low Profile Flip Up Rear Sight Same - Plane Dual Aperture

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  • Brand: A.R.M.S., Inc.
  • Model: 40L-SP
  • UPC: -
  • Availability: Out Of Stock
The A.R.M.S. Low Profile Flip Up Rear Sight #40L SP is identical to the #40L but it utilizes the same plane aperture system. This aperture set allows the operator to choose between large and small apertures without worrying about them being zeroed to different ranges. The Small aperture can also be removed if the user desires the larger CQB aperture only. A.R.M.S. #40L SP Spring Loaded Rear BUIS for the AR15/M16 flat top family of rifles that is easily operated with bulky gloved hands. The Same Plane Aperture deploys either aperture zeroed at the same mark. No worries about range zero changes when switching from small and large CQB apertures. It is designed to be a co-witness backup sight that can deploy in a split second when optics have failed. With a miniaturized windage knob and low mounting height, this ARMS BUIS is ideal for mounting behind or underneath riflescopes or the EOTech HWS and other red-dot sights. The sight is held in the locked down position by a quick release lever, that can be deployed with the flip of your finger. Initial elevation zero is acquired by adjusting the standard M16A2/M4 front sight post. The newly designed 250-300 meter Dual Leaf Aperture and smaller miniature windage dial design allow the A.R.M.S. Low Profile #40L SP spring loaded flip-up rear BUIS sight to sit nearly flush with the top rail when mounted behind an A.R.M.S. base riser.

  • 250-300 Meter CQB Dual Aperture
  • Unique Dual Leaf Aperture
  • Same Plane Aperture Height
  • Miniature Windage Dial: .75 MOA per Click
  • Mounts to Picatinny Rail Receivers
  • Co-witness with M16A2 Front Post


MSRP $144.40
Description ARMS #40 Low Profile with Same Plane Aperture
Finish / Color Black
Manufacturer Part# 40L-SP
Type Sight


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