2016-01-19 05.36.06

This year’s Shot Show, we had the opportunity to get our hands on Silencerco’s Weapons Research Radius, a rail-mounted laser range finder. Besides being the first rail mounted commercial grade laser, the Radius has been designed as an extension of the host weapon. Here are the salient points…

The more common implementation of a laser range finder is a package containing its own optical subassembly. The shooter focuses and sights through the LRF’s eyepiece, fires the laser and reads range in yards or meters. The Radius however is zeroed to the weapon’s optics using an internal visible laser. The shooter does not range by sighting through the Radius; instead, he ranges by sighting through the weapon’s optics. The internal visible aiming laser is aligned with the weapon’s primary sights using windage and elevation adjustments. The visible laser is co-aligned with the IR ranging laser resulting in a perfectly aligned ranging laser. Once zeroed to the weapon, the visible laser can be disabled.

The Radius mounts on any plane, 12 o’clock  through 9 o’clock rail positions, making it highly adaptable. To support that flexibility, Silencerco created a display module that can be removed and rotated to properly orient it for ease of reading – display brightness is also adjustable.

The display module contains the processor and can support implementation of ballistics software. The Radius is also iP68 waterproof rated so it is submersible. The shooter has the option to operate the Radius in continuous mode  and with the proper software package will determine target speed.

The Radius will display 3 ranges, a primary and two secondary range values which as a matter of personal preference should be replaced with just a single value. Silencerco’s approach allows the shooter to detect a bad range value caused by interference from foliage or water. I would prefer to see a different approach where the shooter can set an acceptable standard deviation value during initial Radius setup; then have the Radius provide an average range value with an indicator (* or blinking display) for out of range standard deviation.

For example…

  1. Range 1: 190 (y or m)
  2. Range 2: 333 (y or m)
  3. Range 3: 327 (y or m)
  • Avg. = 283.3 with a standard deviation of 80.88 (y or m)
  • Shooter sets his acceptable sd to 15 (y or m)
  • Radius displays a blinking range of 283.3 (y or m)

Because, the Radius employs a detachable processor, Radius’ possibilities are endless and limited only by software. Although not officially discussed you can expect to see processor modules with other interesting capabilities extending well beyond ballistic calculations.


  • POWER: (2) CR123A Lithium Ion Batteries (Included)
  • HEIGHT: 2.30” LENGTH: 5.80” WIDTH: 2.96”
  • WEIGHT with BATTERIES: 18.2 oz. WEIGHT without BATTERIES: 17.0 oz.
  • RANGING PERFORMANCE: reflective target 1 Mile / non-reflective target: 1,000 Yards
  • M.S.R.P. $999
  • Potential: limitless
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