Rapid-Fire Rangefinder: Hands on with the new SilencerCo Radius

The rail-mountable Radius rangefinder from SilencerCo's SWR group is an amazing piece of equipment.

The rail-mountable Radius rangefinder from SilencerCo’s SWR group is an amazing piece of equipment and can actively range out to a mile. Shown equipped on a Ruger Precision Rifle in 6.5 Creedmoor.

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SWR designed the Radius to be affordable, and compact.

SWR designed the Radius to be affordable, and compact.

There’s something extremely gratifying and addicting about ringing steel at 1,000 yards. With new advancements in technology and ballistics, it has never been easier or more affordable to reach new extremes. Helping us get there is SilencerCo and SWR (SilencerCo Weapon Research).

SilencerCo is well known for their innovative suppressor designs and have some of the quietest cans on the market. A few years ago, they started a research division, SilencerCo Weapon Research (SWR), to broaden their product offerings. Their goal is to “bring cutting-edge technology within reach,” and they have done just that with their first product, the Radius rangefinder.


This isn’t any ordinary rangefinder. It is the first compact rail-mounted rangefinder capable of ranging out to one mile on reflective targets. The Radius can be mounted vertically or horizontally on any standard Picatinny rail.  With continuous range, primary and secondary readings, the Radius allows the shooter to stay on the gun while engaging multiple targets in rapid succession. All this for an MSRP of $999.

The Radius can be mounted on a side rail or on top of an optic (as shown).

The Radius can be mounted on a side rail or on top of an optic (as shown).


  • Power: (2) CR123A Lithium Ion Batteries (included)
  • Height: 2.30 inches
  • Length: 5.80 inches
  • Weight: 18.2 ounces with batteries/17 ounces without
  • Ranging capability: Reflective target: 1 mile; Non-reflective: 1,000 yards
  • Resolution: 1 meter
  • Operational temperatures: -20˚F – 120˚F
  • MSRP: $999


  • The top-mounted configuration made it easy to view the Radius display while remaining on the gun.

    The top-mounted configuration made it easy to view the Radius display while remaining on the gun.

    Aluminum construction with LED display

  • Mounts vertically or horizontally on rail
  • Adjustable windage and elevation knobs
  • Continuous ranging for up to 12 hours
  • Continuous or single-shot operating modes
  • Adjustable display brightness
  • Shock resistant across all calibers
  • Compatible with Picatinny MIL-STD-1913 Rails
  • Included pressure switch for remote operation

Upon first sight, it was immediately obvious to me that the Radius was a high-quality product. It reminded me of something you’d see in a futuristic sci-fi film, in a good way. It’s built on an all-aluminum waterproof housing that feels solid and rugged. The LED display is bright and easy to read. It can be removed and rotated when mounting the Radius on the side or top of the rail. Three possible range readings are displayed in case of interference in your choice of yards or meters.  Each control button, topped with a durable rubber cap, provides positive tactile feedback. Co-aligned with the IR laser is a visible red laser used when zeroing the Radius. Windage and elevation knobs are built into the mount with no tools required for mounting or adjustments. It comes with a remote pressure switch that does well when placed near the trigger for quick single-shot ranging operation. SWR clearly spent a great deal of time designing and perfecting the Radius. It’s refreshing to see a new company create innovative products while maintaining a high level of manufacturing quality.

Using the Radius

The Whittington Center Unknown Distance course is impressive. You can barely see the targets in the distance used for zeroing the Radius.

The Whittington Center Unknown Distance course is impressive. You can barely see the targets in the distance used for zeroing the Radius.

Until recently, I had never had the chance to shoot past 300 yards. Everything I hunt around Texas is typically within 200 yards. I grasped the basic principles of long-range shooting—hold overs, and windage adjustments—but didn’t take it seriously. Precision long-range shooting has become increasingly popular throughout the shooting community and I’ve been wanting to experience it for myself. The universe unexpectedly manifested an invitation for me to shoot with the new Radius rangefinder paired with a suppressed 6.5 Ruger Precision rifle at distances exceeding 1,000 yards. A fantasy come true.

I flew to Albuquerque and drove 250 miles north to the T.O. Ranch just south of the Colorado border, near Raton New Mexico. The first day of shooting took place at the NRA Whittington Center. Founded by the NRA in 1973, the Whittington Center is an impressive shooting facility with a wide variety of ranges for all shooting disciplines. They offer full guided hunts, training courses and on-site lodging/campsites, and it hosts competitions. There’s also an amazing gun museum in the back of the gift shop.

After being greeted by our host and signing the appropriate waivers, we ventured to the Unknown Distance course that had targets as far as you could shoot. We were all anxious to sight in the Radius.

Our Setup

The remote pressure switch plugs into the side of the Radius.

The remote pressure switch plugs into the side of the Radius.

Setting up the Radius was remarkably easy. You just release the quick-detach lever and place it on your rail. Close the QD lever to lock it in place. I opted to mount the Radius on the top of the scope while everyone else chose to mount theirs on the side of the rail. I prefer the top mount configuration for a few reasons: It feels more balanced on top, it’s easier to sight in without having to look for the adjustment knobs, and it’s faster for me to see the display when scanning targets.

To sight in the Radius, affix the provided target to a vertical surface and place a couple pieces of reflective tape on the horizontal and vertical edge of the paper target. (The reflective tape makes the visible laser show up easier when sighting.)  Then, measure the distance from the center of the reticle on your scope to the visible laser on the Radius.  Mine was at 3 inches above the center of the reticle. Position the reflective dot 3 inches above the center of the paper target. This reflective dot is where the visible laser will end up after zeroing the Radius. The dot ensures the Radius is perfectly parallel to the reticle on the scope. Sitting 50 yards away from the paper target, I turned on the visible laser and aimed for the reflective tape. I quickly found the laser and started making the necessary windage and elevation adjustments to meet the reflective dot. Once the laser is lined up, turn it off and you’re all set.

The first target was a 3-inch-square steel plate with a car painted on it. With the target in my sights, I engaged the pressure switch to operate the Radius. “812 yards” immediately started glowing from the display. Using 143 -gr. ELD-X Hornady ammunition, I checked my dope card for 800 yards and dialed my scope up 5.6 mil. I aimed for the car door handle and pulled the trigger—a quiet whisper was followed by a loud GONG as the projectile hit the target. All I could think was, “that was way too easy.” Mystified, I moved on to a smaller 16-inch bullseye plate. The Radius confirmed the target at 857 yards. After adjusting my scope an additional .2 mil, I put the bullseye in my crosshairs and gently squeezed the trigger. Another quiet puff emerged from the muzzle with a THWACK echoing through the canyon. I couldn’t wipe the smile off my face.

First station of the author's shooting course with the Radius.

First station of the author’s shooting course with the Radius.

We were all getting comfortable with the Radius system and our rifles. To make it interesting, we set up a table at a 35˚ incline. The only rule was shooters must use the table in some way to steady themselves while engaging four targets. Shooters must hit targets from right to left, and back then shoot a random fourth target called by the spotter. I propped my gun on the edge of the table as I sat on the incline and steadied myself as best I could and set the Radius to continuous range. The first target was 650 yards; adjusting my elevation, I planted one dead center. Second target, 612 yards—hit. Third target, 760 yards—hit. Man, this was too easy! The last target called was a small 5-inch rock sitting on the cliff face at 675 yards—turned to dust.  My jaws were starting to get sore at this point from the permanent grin on my face. Transitioning from the reticle to observe the Radius display felt natural and seamless. The continuous range feature saved time and ranged targets immediately. The Radius gave me an overwhelming amount of confidence.

The next course demonstrated the practical use of the rangefinder when sitting in awkward positions that are often encountered during a hunt. We set up three different stations and three different targets. Each shooter had to place two successful shots on target before advancing to the next station. The first station was a prone shot at the bottom of the hill target at 411 yards. Second station was 30 yards up the hill. The second station forced you to sit on a low branch using the branch above as a rest, with a target at 420 yards. The final station, 20 yards over at another tree using it as a rest at 405 yards. I missed my second shot on the first target, but was still able to run the course in 58 seconds. I’d never be able to shoot that fast using a handheld rangefinder. Again, the continuous range made it possible to quickly range and adjust accordingly.

The electronic Mason Target after being punished with 6.5 projectiles all afternoon.

The electronic Mason Target after being punished with 6.5 projectiles all afternoon.

The final challenge of the day was a shoot-off for an Omega suppressor. We were fortunate enough to have a Mason Target Systems Pacifica Electronic Target for our competition. The target features an 18×18-inch AR500 steel plate with wireless capabilities out to 1,500 yards. Each hit is recorded and scored on an iPad app. We setup the target 600 yards down range and each took five shots at the target. It was late in the day and the heat mirage made it difficult to see the target, but I ended up scoring 30 points putting me in a three-way tie. The final shoot off—one shot each. The first shooter hit low; 5 points. My turn. I held at the top edge of the target gently squeezed the trigger and scored 8 points. The last shooter missed. Unbelievably, I won! We called it a day, packed up our tables and headed back to the ranch.

Real-World Usage

Early the next morning, we drove to fields littered with prairie dogs. Before you get too upset and call PETA, let me explain that prairie dogs cause many issues for ranchers and livestock. They create vast underground tunnel systems that can cause injuries to horses, humans and livestock.  Prairie dogs are carriers of diseases and decimate crops. With that said, we were essentially doing the ranchers a favor.

Ranging prairie dogs at 375 yards was no problem for the author.

Ranging prairie dogs at 375 yards was no problem for the author.

We sighted in our Radius’ again and loaded up the rifles. First one ranged at 210 yards—I barely heard the gun go off and he sure as hell didn’t. Gone in a flash, his confused buddy standing next to him quickly joined him on the other side. I was able to successfully range a small 12-inch prairie dog at 450 yards. The other shooters using the side-mounted configuration had a harder time getting positive readings on the small rodents. Another reason why I believe the top-scope mount is the way to go. The Radius proved to be a treasured tool when shooting these little critters. It allowed me to quickly range and adjust between targets. My accuracy increased and ammunition was rarely wasted. The only time I had difficulty ranging the tiny varmint was at 500 yards in the late afternoon. Heat mirage was obscuring my vision, making it difficult to get a reading.

We ran the rifles hard, throwing 1,400 rounds down range over the two days of shooting. The Ruger Precision Rifle proved to be a top performer and more accurate than most $3,000 setups. One problem I had was with the Magpul magazine not fully seating properly, but I’ll attribute that to a faulty magazine and user error. The Vortex Razor HD scope with FFP reticle was crystal clear and served me well during the shoot. I only wish they would make it lighter.

After running up a hill and using the tree as a bench and rest, I was able to put two hits on target in just 4 seconds. Good luck doing that with a hand-held rangefinder.

After running up a hill and using the tree as a bench and rest, I was able to put two hits on target in just 4 seconds. Good luck doing that with a hand-held rangefinder.

The Omega suppressor made the shoot much more enjoyable. With virtually no recoil or and little noise, I could shoot all day long without getting fatigued. It’s nice to be able to have a conversation 6-feet away from five guys shooting rifles without wearing ear protection, and no bulky ear muffs to hassle with. Not having to wear ear protection increases your situational awareness in a hunting scenario and could be the difference in having a successful hunt.

The Radius performed well throughout the two-days of abuse. The battery indicator on my unit fell to 75% at the end of day 2. It was on continuous mode most of the time and sat in the sun for several hours. The only issue we had during the shoot was one pressure switch connector got bent from the rifle falling over. It didn’t damage the Radius, but it needed a new switch.

Overall the Radius exceeded my expectations in terms of performance and accuracy. It was easy to install and use. If you ever hunt in canyons or stalk big game in the mountains, then you know how valuable having the right equipment can be and how important each second is when going for the kill. The Radius saves you time and frees your hands, giving you complete control. If you’re in the market for a rangefinder, look at the Radius. I know I’ll be ordering one soon.

The Radius proved to be versatile and useful when attached to the spotting scope.

The Radius proved to be versatile and useful when attached to the spotting scope.

The small reflective dot represents the aiming point for the visible laser on the Radius during setup.

The small reflective dot represents the aiming point for the visible laser on the Radius during setup.

{ 8 comments… add one }
  • Wayne A Lincourt November 9, 2020, 4:04 pm

    Great job, Austin. Thoroughly enjoyed it.

  • greg August 1, 2016, 3:25 pm

    i’m not as familiar with long range shooting as i’d like… help me out? i can see that the range finder can be zeroed with the scope and rifle at a set distance… say, 100 yards and at that distance one could actually see the red laser dot. but if you are dialing the scope reticle’s elevation for more distant targets (i’m not considering the holdover option), the scope is no longer looking at the same aiming point as the range finder (and the laser won’t be visible for confirmation at longer distances). the farther the range to target, the greater the difference of vertical alignment between the range finder’s aim to scope reticle. at some point the range finder can’t be seeing the target that the scope is seeing… yes,… no,… what am i missing here??

    • Austin Van Gilder August 1, 2016, 5:53 pm

      You can zero the Radius at a distance as close as 25 or even 15 yds. The key to making sure the Radius is set up properly is the measurement between your reticle and the visible laser. With an accurate measurement, your radius will run parallel to the barrel out to infinity.

      For example, my Radius was mounted 3 inches above the center of my scope which is where the corresponding reflective dot is placed above the center of the paper target. If you expand the last photo of the paper target, you will notice the center reads “Center of optic” which is where you aim your scope. The red reflective dot 3 inches above the center of optic represents the distance between the Radius and my scope and ultimately where the visible laser will be adjusted to.

      • greg August 1, 2016, 10:54 pm

        The barrel and range finder aim points are parallel to infinity,… I get that. On the other hand the scope reticle and range finder aim points (barrel aim pt.same as r.f.) are not parallel. Therefor at any distance greater than your original sight-in, the range finder is pointed proportionally higher than the scope reticle and not seeing the same target as the scope reticle. The longer the distance, the greater difference between the two aim points. I would be understanding all this if the range finder and scope reticle were adjusted together in parallel wherein they’d always be looking at the same target (plus the r.f. height above the scope reticle).

        • Austin Van Gilder August 2, 2016, 10:47 am

          The Radius and scope reticle ARE adjusted together in parallel (sorry its kind of hard to explain). That’s why you aim the visible laser at the red dot on the paper target while holding the scope reticle in the center of the target, to get them parallel. The reticle and the visible laser do not converge on a single point, if they did, then you would be correct in saying the r.f. will only be accurate to the distance it was sighted in at.

  • Walt August 1, 2016, 12:11 pm

    How is this attached above the scope? Looks to me like you’ve got some type of upper on the rings with a built in rail. Where does this come from?

    • Austin Van Gilder August 1, 2016, 2:21 pm

      The mount used for the Radius is a Niteforce “Ruggedized Accesory Platform” scope ring attachment. It attaches on your current scope mount with a Picattiny rail on top. Works great!

  • Will Drider July 26, 2016, 5:51 pm

    Faster then working USMC Mil Dot, as long as the target is reflective and the batteries last/are available. I do like it!
    Odds are you will not have a good spotter when SHTF. I would like to see a Gen II that straddles the forend vice riding on it.

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