You've already got a day scope zeroed to your rifle, and you don't want to give that up to hunt after dark. That's the exact problem a clip-on solves: mount it in front of your existing optic, and your reticle, your turrets, and your zero all stay exactly where they are. This guide breaks down the best clip-on thermal scope options by sensor resolution, weight, and how each one pairs with the magnification you're already running, so you can add thermal capability without replacing gear that already works.
The ATN TICO 6 640 1-15x is our top pick for hunters who want to keep their day scope and add thermal in front of it. A 640×512 sensor at ≤18mK NETD gives you enough resolution to identify game through your existing glass, and the removable eyepiece turns the same unit into a handheld monocular when it's off the rifle.
Quick Answer: Best Clip-On Thermal Scopes
- Best overall: ATN TICO 6 640 1-15x — 640×512 sensor, works with day scopes up to 15x magnification.
- Best for the money: ATN TICO 6 384 1-12x — same platform, 384×288 sensor, lower price of entry.
- Best lightweight option: ATN TICO 6 256 1-8x — 511 g, the lightest of the three.
- Best for high-magnification day scopes: ATN TICO 6 640 1-15x — rated for day optics up to 15x without losing image quality.
- Budget pick: ATN TICO 6 256 1-8x — lowest price in the lineup, still built on the same 6th Generation engine.
Why the Latest Generation Stands Out
Earlier clip-on designs asked you to trade image quality for convenience — you kept your day scope, but the thermal image through it was a step behind a dedicated scope. The TICO 6 line closes most of that gap with ATN's 6th Generation thermal engine: a 12μm VOx uncooled sensor running a 50 Hz refresh rate, paired with SharpIR© AI processing that sharpens edges and boosts contrast in real time. The result is a clip-on image that holds up against a lot of dedicated thermal scopes, not just a passable add-on.
The bigger shift is how the mounting works. The Quick Detach Mount attaches to a Picatinny rail in front of your scope and comes off in seconds without disturbing your zero — because the clip-on never touches your scope's internal adjustments, your day-scope zero holds. For hunters who've spent a season dialing in a rifle and don't want to redo that work, that's the entire value proposition in one sentence.
| Model | Sensor | NETD | Optimal Day Scope Mag. | Detection Range | Battery | Weight | Price |
|---|---|---|---|---|---|---|---|
| TICO 6 640 1-15x | 640×512 | ≤18mK | 1-15x | 3,500 m | ~7 hrs | 564 g / 1.24 lbs | $4,285 |
| TICO 6 384 1-12x | 384×288 | ≤18mK | 1-12x | 2,710 m | ~8 hrs | 524 g / 1.15 lbs | $2,415 |
| TICO 6 256 1-8x | 256×192 | ≤20mK | 1-8x | 1,500 m | ~8 hrs | 511 g / 1.12 lbs | $1,205 |
Best Overall: ATN TICO 6 640 1-15x
If your day scope runs up to 15x magnification, this is the clip-on that matches it without becoming the weak link in the setup.
Image Quality
The 640×512 sensor at ≤18mK NETD delivers enough resolution and thermal sensitivity to identify game, not just detect a heat signature, when you're looking through it and your day scope stacked together. SharpIR© AI processes every frame in real time, sharpening edges and refining detail so a coyote in brush doesn't turn into an unreadable blob. Six color palettes — White Hot, Black Hot, Iron Red, Alarm, Green Hot, Sepia — cover different terrain and contrast needs.
Range and Magnification
Detection range is rated at 3,500 meters, and the unit is built to pair with day scopes up to 15x magnification without the image degrading. That optimal-magnification rating matters: pairing a low-resolution clip-on with a high-power day scope just magnifies noise, so matching sensor to scope power is the actual engineering behind the number.
Battery and Build
A single replaceable 18650 battery runs about 7 hours, and the housing supports external power over USB-C if you need to extend a sit. At 564 g (1.24 lbs), it mounts in front of your optic without meaningfully changing your rifle's balance. The magnesium alloy body carries a 6,000-joule recoil rating and an IP67 waterproof rating, and runs from -30°C to 55°C.
Mounting and Smart Features
The included Quick Detach Mount (QDM) attaches to a Picatinny rail in seconds. If your rifle doesn't have a forward rail, the optional Scope Mounting System threads directly onto your day scope's objective lens instead — ATN sells that adapter in three sizes to match different objective diameters, priced at $197 ($179 promo). The removable eyepiece ($219, $199 promo) converts the same unit into a handheld thermal monocular for scouting off the rifle. Recoil Activated Video automatically saves footage from before, during, and after the shot, and built-in Wi-Fi with the ATN Connect 6 app lets you stream the feed to a phone or tablet.
Buy this if: your day scope runs up to 15x and you want the sharpest image the TICO 6 line offers. Skip it if: your day scope tops out around 8x — you'd be paying for resolution your optic can't fully use.
Mounting takes two forms depending on your rifle. On a modern sporting rifle with a Picatinny rail forward of the scope, the QDM clamps on and locks in seconds — no tools needed to bring it on or off between hunts. On a traditional bolt-action hunting rifle without that forward rail space, the optional Scope Mounting System threads onto your scope's objective lens instead, which is how most bolt-gun hunters run the TICO 6 in the field.
Best for the Money: ATN TICO 6 384 1-12x
Same 6th Generation engine, same mounting system, same removable eyepiece — the 384×288 sensor trades some resolution for a lower price.
Image Quality
384×288 at ≤18mK NETD still identifies game at the ranges most hunters actually shoot, especially paired with a day scope in the 6-12x range where the clip-on's resolution isn't being stretched thin. SharpIR© and the same six color palettes carry over from the 640 model.
Range and Magnification
Detection range comes in at 2,710 meters, and it's rated as the optimal match for day scopes up to 12x. Push it past that and the image starts to show its resolution limits the way any sensor does when magnified beyond its design point.
Battery and Build
Slightly lighter than the 640 at 524 g (1.15 lbs), with a longer battery rating of about 8 hours on a single 18650. Same IP67 housing, same 6,000-joule recoil rating, same -30°C to 55°C operating range — durability isn't where this model saves money.
Buy this if: your day scope tops out around 8-12x and you want the full TICO 6 feature set at a lower price. Skip it if: you're running a high-power day scope past 12x that would outresolve the sensor.
How to Choose a Clip-On Thermal Scope
Match the clip-on's optimal day scope magnification to what you're actually running. A 640 sensor rated to 15x wastes its advantage on an 8x day scope, and an 8x-rated 256 sensor gets stretched thin behind a 16x day scope. Check your scope's top-end magnification first, then pick the clip-on rated for it.
Check your rifle's forward rail space. The QDM mount needs a section of Picatinny rail in front of your scope; if you don't have one, the optional Scope Mounting System threads onto your scope's objective lens instead, so confirm your scope's objective diameter before ordering that adapter.
Weight adds up in front of the balance point. A clip-on mounted forward of your scope shifts weight further from your shoulder than a scope-mounted optic does, so if you're already running a heavy rifle, the 256 model's lighter build (511 g) is worth considering even if you'd otherwise choose a higher-resolution sensor.
Decide if you need the monocular function. All three TICO 6 models accept the optional eyepiece adapter that turns the clip-on into a handheld thermal monocular. If you also want to scout on foot before you're on the rifle, that dual-role capability is worth factoring into which model you buy, since it applies across the line.
Frequently Asked Questions
Does a clip-on thermal scope require re-zeroing my rifle?
No. The clip-on mounts in front of your day scope and doesn't touch its internal adjustments, so your existing zero holds. You're adding a device in front of your optics, not replacing the optic itself.
What magnification day scope works best with a clip-on?
It depends on the clip-on's sensor resolution. The TICO 6 640 is rated for day scopes up to 15x, the 384 model up to 12x, and the 256 model up to 8x — match the clip-on to your scope's top-end magnification rather than buying the highest resolution regardless of fit.
Can I use a clip-on thermal scope as a handheld monocular?
Yes, if it has a removable eyepiece adapter. All three TICO 6 models support this — attach the optional eyepiece and the clip-on functions as a standalone thermal monocular for scouting off the rifle.
How does a clip-on mount to my rifle?
The included Quick Detach Mount attaches to a section of Picatinny rail in front of your scope. If your rifle doesn't have forward rail space, an optional Scope Mounting System threads directly onto your day scope's objective lens instead.
How much does a clip-on thermal scope weigh compared to a dedicated thermal scope?
The TICO 6 line runs from 511 g to 564 g depending on sensor size — lighter than most dedicated thermal scopes, but that weight sits forward of your existing day scope, which changes your rifle's balance more than a scope-mounted optic would.
What's the difference between the 640, 384, and 256 TICO 6 models?
The main differences are sensor resolution, detection range, and the day scope magnification each is optimized for. The 640 model offers the highest resolution and longest detection range (3,500 m); the 256 is the lightest and most affordable, built for day scopes up to 8x.
Is a clip-on thermal scope better than a dedicated thermal rifle scope?
Neither is universally better — a clip-on preserves your existing day scope and zero, while a dedicated thermal scope is purpose-built as a single unit. If you already own a day scope you don't want to replace, a clip-on gets you thermal capability without starting over.
Bottom Line
A clip-on makes sense when the day scope on your rifle already works and you don't want to touch it. The ATN TICO 6 640 1-15x pairs a 640×512 sensor with a mount that comes on and off in seconds, keeps your zero intact, and doubles as a handheld monocular when you pull it off the rail. If your day scope runs lower magnification or your budget points elsewhere, the 384 and 256 models carry the same mounting system and monocular function at a lower resolution and price. See full specs on the TICO 6 640 product page, or browse the full thermal clip-on lineup to match a model to your day scope.
