Chad Wallace

May 3, 2025

Review, Optics, Gear

ZeroTech Thrive HD 1-8x24

Chad Wallace

May 3, 2025

Review, Optics, Gear

ZeroTech Thrive HD

1-8x24 Review

ZeroTech Optics sent Rusty and I one of their new Thrive HD 1-8x24 Low Power Variable Optics (LPVO). For a bit I was trying to decide what to put it on. Then SRU and Foxtrot Mike made the decision for me, by sending me a bullpup kit. The new Thrive HD was a perfect fit. ZeroTech’s new LPVO has some great features, some clear glass, and some other stuff.

The ZeroTech Thrive HD 1-8 is the first LPVO in the Thrive lineup. The Thrive series of optics is primarily built for hunters, but that does not mean that there is not crossover into other types of shooting. In fact, the bullpup kit I mounted it on probably won’t see a day of hunting in its lifetime. Unless the random coyote pops up when I have it on hand. Being that the Thrive HD 1-8 is a second focal plane optic, it does lend itself nicely to hunting. However, the way the reticle is set up also works well for run and gun type competition. I think it is more of a dual duty style of optic.

Construction on the Thrive HD is somewhat simplistic. ZeroTech constructs the 1-8 using 7075 T6 aluminum. 7075 is stronger and lighter than the typical 6061 that a lot of other scope manufacturers use in their $450 price range LPVO’s. It weighs in at 22 ounces, which also falls right in line compared to other LPVO’s. As with most LPVO’s, the Thrive HD uses a 30 mm outer tube diameter. The adjustment turrets are of the capped style. This gives it a clean look. Since this is not a scope for long range work, the capped turrets do not detract from anything.

ZeroTech throws a few “extras” in the box that are pretty nice. Up first is the Thrive HD’s flip up covers. These are not your everyday plastic ones. They are aluminum and screw on. Using the supplied tool, you can tighten them down to your preferred location. This is especially nice for the ocular lens with the fast focus eyepiece. Since you need to focus the eyepiece to your eye, you can then loosen the flip cap, align it, and re-tighten it, so it works correctly. The 1-8 also comes with a removable throw lever. This throw lever uses a little rail type attachment. So one just slides it on and tightens the little screw. Also included is a neoprene style one piece scope cover. It is a really nice cover.

When looking at optics, the reticle can be really important. The Thrive HD 1-8 uses ZeroTech’s PHR 4 illuminated reticle. This reticle, for some reason, reminds me of the old German #1 reticle. It is not even close, but here is my best explanation. The PHR 4 has 3 fairly thick crosshairs, 1 up from the bottom and then 1 on each side. These then reduce down to 0.5 MOA thick lines. These lines extend 7.5 MOA out toward the center reticle. There is then a 2.5 MOA space until the center reticle starts. Yes, there is a center reticle. The center reticle is also the part that illuminates. They call this a floating reticle and is more akin to a standard small thin crosshair reticle. It measures 5 MOA. It also has a 0.5 MOA dot in the center. Of course all of these measurements are at 8x. There are 5 brightness settings on the Thrive HD. On/Off and adjustment are a little different than what you might be used to. On the left side of the scope is the battery cap. In the center of the cap is a button. This button is pressed to turn on the red illumination, in the last setting that was used. Just push it again to cycle through the 5 brightness levels. It cycles from brightest to darkest, and then repeats itself. Since the Thrive HD does not have any shake awake function, you will want to remember to turn it off when done. To do this you just hold the button down for about 3 seconds and the illumination turns off. The brightness is not daylight bright, but is very useful. ZeroTech does not sell the Thrive HD as daylight bright, so I was not expecting it to be.

The Thrive HD 1-8 has capped turrets for adjustment. To adjust the LPVO, you must first remove the caps. Underneath are some decently nice knobs. These are easily adjusted with your fingers. The ¼ MOA clicks are a tiny bit mushy, but can be heard and felt easily enough. The ¼ MOA adjustments are a nice feature. A lot of 1-8 LPVO’s have ½ MOA adjustments. These windage and elevation knobs can also be set to zero, after the initial sighting in. That way you at least have a reference when making further adjustments.

I was impressed with the clarity on the Thrive HD. Looking through it produces clear images with no detectable color differences. It did not seem to matter if it was at 1x or 8x, nothing seemed distorted. However, the eyebox on the 1-8 is unforgiving at 8x. You have to be in just the correct spot to get a good image. At 1x, I did not notice any problems getting a clear picture through the eyebox. This is my only real complaint about the Thrive HD 1-8.

As mentioned, I mounted up the Thrive HD to a bullpup. This required me to put it in a higher optics mount. I used a Geissele 1.93 scope mount and it was perfect for the 1-8. You can read the SRU review to find out why the mount is turned around. I mention this so you get the idea of how I used the Thrive HD. This LPVO is really clear for its price range. I would compare it to some optics that are priced a couple of hundred more. It really shines at 1x with the PHR 4 reticle. Then the 8x gives you enough magnification to identify targets easily. The adjustment ring, with its optional throw lever, operates super smooth. Those flip covers take a little bit of getting used to, they are a bit stiffer than the normal ones I use. All those little add-ins are a nice touch too. The Thrive HD did everything I wanted it to do.

The Thrive HD 1-8x24 is a good option for those looking for a LPVO. It is decently priced for the quality and clarity you get. It has a very useful illuminated reticle. The throw lever, to adjust the magnification, is super smooth. You really get a lot of optic for your money with the ZeroTech Thrive HD line. Go check out Zerotech’s line of optics, they might have something that fits with your shooting style.

Firearms Insider Reviews - Key Points

Claim to Fame:

1-8 power LPVO with a hunting style MOA reticle

Target Market:

Anyone wanting a LPVO in the 1-8 power range

Features, Benefits, and Specifications of this product:

Focal Plane Second (SFP)
Reticle calibrated magnification power: 8x
Magnification Range: 1-8x
Objective Lens Diameter: 24mm
Main Tube Diameter: 30mm
Main tube Material: 7075 – T6
Turret Index Value: 0.25MOA
Internal Elevation Adjustment: 90 MOA
Internal Windage Adjustment: 90 MOA
Parallax Adjustment Range: Fixed 100 Meters
Exit Pupil Diameter: Low: 8mm; High: 3mm
Eye Relief: 3.58-3.94 inches or 91-100mm
Field Of View @100 Meters: Low: 41.6 m; High: 5.1 m
Field of view @ 100 Yards: Low: 124.8 ft; High: 15.5 ft
Lens Coating: Fully Multi Coated (FMC)
Weight: 22 ounces or 624g
Illumination: Yes
Waterproof Rating: IPX7
Aluminum flip covers
Adjustment tool
Neoprene scope cover

What other aesthetic options or finishes are available?

G4 reticle

What others are saying?:

Nothing found as of publishing

Our Rating:

Pros:

Good clarity
Easy to use reticle
Brightness adjustment
Throw lever
Premium flip covers

Cons:

Tight eyebox
Only 5 brightness levels
No shake awake brightness feature

Score: 7.50 Good

Favorite Link: SRU Bullpup Chassis review

Chad Wallace

November 1, 2023

Review, Optics

Primary Arms SLx 3-18x50 Gen 2

Chad Wallace

November 1, 2023

Review, Optics

Quality optics have become affordable for most shooters in the last few years. One no longer needs to spend $1000, or more, to get a clear quality optic. Primary Arms has been aiding us shooters with these types of optics. Their new Gen 2 SLx 3-18x50 FFP is one of those. This optic has features that should make it cost twice the price.

The Gen 2 SLx 3-18 is packed with features. Coming in first is its First Focal Plane (FFP) reticle. Yes, this $500 optic has a FFP Christmas tree style reticle. So when you zoom in, all the reticle’s MIL marks stay the same. This allows you to hold over for bullet drops, or wind, at any reticle setting. This particular optic uses Primary Arms’ ACSS Athena BPR Mil reticle. I won’t go much into the reticle’s design as it uses MIL’s in a very useful pattern. But, the reticle is illuminated to help one see better in low light. It’s pretty bright for this size of optic. This ACSS reticle also uses a small center chevron, think triangle, for aiming. Most optics like this just use a small dot. The top point of the chevron can be used for very precise shots, more so than if one were to use an optic with a small center dot. The other nice aspect to this reticle is its built in ranging ladder. The ladder is in the upper right hand portion of the optic. This puts it out in the part of the reticle that is seldom used. I really like how Primary Arms designed the ACSS Athena reticle. It is easy to use, even for someone like me that is used to using a MOA reticle. I even mentioned to Primary Arms that they were starting to convert me to MIL reticle scopes. Part of that comment was due to the SLx 3-18x50.

At 18x, Tower Light is approximately 350 yds away. Light is also 15” wide for ranging purposes.

Since I was talking about the reticle, let's go into the optics themselves. This SLx 3-18 gen 2 is exceptionally clear. This is why I say it far exceeds its class. I had zero problems with the clarity, even at its full magnification of 18x. I could easily make out 17 HMR holes in targets at 100yds. The crispness of the glass is also really good, though I did find it to drop off a little at longer ranges and at higher magnification, but it never caused any problems. I did find the parallax adjustment to be a little touchy. At least when focusing the parallax adjustment on targets between 200-400 yards. They were the hardest to get focused. Other ranges didn’t seem to be as touchy, even the lower ranges like 15-100 yds. I will give the SLx credit for having a parallax adjustment that goes from 10 yds to infinity. Other than those minor issues, the SLx 3-18 gen 2 has great glass for the money.

The function of the SLx 3-18x50 gen 2 has some outstanding features also. My absolute favorite is that this optic has a true zero stop on the elevation turret. Once you find out where your zero is, just set the stop and you will never have problems finding your zero again. No matter where you adjust to, just turn the back down until it stops, you are now at your zero setting. The turrets have been upgraded over the first gen SLx 3-18. They are larger so you can get a better feel on them. This also makes them easier to turn. These turrets also have fairly good clicks to them. You can feel and hear them. The elevation turret is a target style and not capped. The windage turret is capped….unless you want it to be a target style turret. Primary Arms includes a target style turret that you can replace the capped one with. So essentially you have the best of both worlds. I typically don’t dial for windage, so I left the turret in the capped version. One other feature, that Primary Arms added to the SLx 3-18 gen 2, is their changeable throw lever for the magnification ring. Instead of being stuck with whatever the optic company gives you, Primary Arms gives you options. The throw lever, that comes installed, is fairly tall and makes it easy to adjust magnification. But, if it’s not your thing, just take it off, or get one of the other throw lever options.

I installed the SLx 3-18x50 gen 2 on my semi-precision 243. Being that the 243 is not your standard 1000 yd cartridge, more of a 800 yd one, I thought this magnification range would be a perfect fit for it. All I can say is that it worked out great on this rifle. Don’t get me wrong, the SLx 3-18 gen 2 is perfectly capable of going out to 1000 yds clearly. My eyes are old and like a little more magnification when reaching out farther. A while back, 10x was adequate for 1000 yds. I view a 3-18 as more of a mid to long range optic. If I was looking for something in the longer range category, I’d look into the Primary Arms 5-25x56.

Primary Arms did a great job designing the SLx 3-18x50 FFP gen 2. Basically it reaches above its pay grade and into the realm of optics that cost twice its price. It has good optical clarity and a top notch reticle. The SLx 3-18 gen 2 also functions extremely well with those large turrets and zero stop. It is a little on the heavy side, but for $500 you can’t go wrong. So if you think you might need a top notch, value priced optic, in the 3-18 power range, do yourself a favor and check out the SLx 3-18x50 gen 2 from Primary Arms