Nightforce: BLEM Configurable Field Spotting Scope (CFS), Accessory Cage Kit, 6-36x50mm F1, Tremor4™

All BLEM Optics are Non-Refundable! All orders for optics and related items will be verified before shipment.
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BLEM Model

May include scratches, dings, or handling marks. Comes with box, factory paperwork, and all original accessories. No other discounts apply, all BLEM optic sales are final. 

New MHSA optic guarantee: If you're not happy we're not happy. Customers have 30 days to exchange, must have been purchased from Mile High Shooting with matching serial numbers. Must be in "like new" condition, with box and all paperwork, free of damage. Customers pay shipping both ways, one exchange per purchase.

The Configurable Field Spotting Scope Accessory Kit (CFS) 6-36x50mm F1 was designed with practical field use in mind, with an emphasis on balanced ergonomics, flexible configurations, and refined optical quality, while maintaining the ruggedness Nightforce is known for.

This first focal plane spotting scope features reticles that are adapted from the most popular riflescope reticles. The field-ready nature of the CFS 6-36 is reflected in the streamlined, compact, and straight design, which allows for convenient, snag-free storage and transport in, or on, a pack. The rubber knurling, 120° travel, and central location of the user controls aid in quick adjustments, while minimizing unnecessary movement and maintaining stability.

Designed with configurability in mind, the Spotting Scope Accessory Cage and Spotting Scope Accessory Platform (s-RAP) provide reliable platforms for attaching thermals, night vision, red dots, laser rangefinders, data cards, and other devices, making the CFS 6-36 ideal for the professional user.

The TREMOR4™ advanced spotting scope reticle is designed for use with the TREMOR3™, or TREMOR5™ reticles. It is also an exceptional reticle for spotting with any other milliradian based reticle. The Horus Grid, patented time of flight wind dots, and TREMOR™ reticle chevrons give this spotting reticle maximum capabilities.


  • Overall Length: 14.1 in / 358 mm
  • Objective Outer Diameter: 65 mm
  • Eyepiece Outer Diameter: 52 mm
  • Dovetail Base Length: 3.6 in / 94 mm
  • Cage Length: 5.1 in / 130 mm
  • Rail Length: 14 in / 356 mm
  • Rail to Optical Center: 1.5 in / 38 mm
  • Field of View @ 100 yd/m: 6x – 37.2 ft / 12.4 m, 36x – 7.2 ft / 2.4 m
  • Exit Pupil: 6x – 5.8 mm, 36x – 1.3 mm
  • Eye Relief: 50 mm
  • Close Focus: 21.9 yd / 20m
  • Spotting Scope Weight: 33.7 oz / 955 g
  • Cage Weight: 5.1 oz / 144 g

What’s in the Box:

  • Padded Field Case
  • Adjustable eyecup – installed
  • Eyepiece Lens Cap – installed
  • Objective Lens Cap – installed
  • T15 Torx Wrench
  • Fob Lens Cloth
  • Owners Manual
  • Spotting Scope Accessory Cage
  • (x2) M-LOK® picatinny rail segments
  • 1/8 in Hex Wrench