InfiTac FML19 review: a 384x288 thermal the size of a red dot
Our verdict: 4.3/5. The InfiTac FML19 is a thermal sight in a red dot sized body: InfiTac lists it at 4 oz or less on a standard RMR footprint, with a 384x288 sensor behind a 19 mm F1.2 lens, a 60 Hz refresh rate, a 1.4 inch touch screen and three reticle options. It is the higher-resolution sibling of InfiTac's FMP13. InfiTac sells it as a pistol sight, but no OpticsPlanet reviewer describes a pistol setup: owners describe a 45 degree offset on a PSL rifle, another offset mount, and mounting it in front of an EOTech or a red dot. The trade-offs are a small screen and field of view, a close working range, one CR2 battery at a time, and rifle mounts that cost extra. Our best clip-on thermal guide points to it as a micro thermal sight on an RMR footprint.
OpticsPlanet shoppers rate it 4.9/5 across 9 reviews, a small and recent record. The version we card is the new FML19 at around $1,100. Check price and availability on OpticsPlanet.
How we reviewed it: a research-based review built from InfiTac's FML19 product page and FAQ, InfiTac's Fast Mini series page, the retailer listing and all 9 owner reviews on OpticsPlanet. We have not used this sight ourselves; the score is our editorial opinion and owner ratings are shown attributed to their source. Claims we could not confirm on InfiTac's site are left out. See how we evaluate.
What the FML19 is
InfiTac's Fast Mini series has two compact thermal sights: the FML19 reviewed here and the FMP13. InfiTac names the FML19 a thermal pistol sight, and its product page describes it as a multi-function thermal pistol/rifle sight. OpticsPlanet lists it as a thermal imaging rifle scope. It is not a clip-on: it shows a thermal image with its own reticle on the screen, and it bolts to anything cut for an RMR.
The retailer's title calls it "2x19mm". That 2x is not the optical magnification: OpticsPlanet's own spec table and InfiTac both list 0.5x, and InfiTac's digital zoom steps are 1x and 2x. InfiTac lists a 13.8° x 10.3° field of view. The screen is 1.4 inches; InfiTac gives its resolution as 360x300, while the OpticsPlanet spec table lists 384x288 for both the sensor and the display. We use InfiTac's figure.
InfiTac's in-the-box list for the FML19 includes the sight, an RMR pistol adapter, screws and a tool, two heated targets for zeroing, two rechargeable CR2 batteries, a charger, a USB-C cable, a lens cloth, a sticker, a hook-and-loop fastener, a manual and a warranty card. The OpticsPlanet package-contents line names only the sight, so confirm the box contents with the retailer. Rifle mounts are sold separately: InfiTac's optional accessories include a PM01 Picatinny rail mount, a PM02 30 mm ring mount, a PM03 45° offset mount and a PM04 Aimpoint Acro mount, plus RMSc, DPP and Glock MOS pistol adapters and a PC01 protective cover.
How it compares with the FMP13
The FML19 and the FMP13 share the RMR footprint, and InfiTac's comparison table lists the same 1.4 inch 360x300 screen and 60 Hz refresh rate for both. The FML19 adds a bigger lens, a higher-resolution sensor and longer listed ranges, and it costs more.
| Model | Sensor | Lens | NETD | Detection / recognition | Batteries in the box | OpticsPlanet price |
|---|---|---|---|---|---|---|
| FML19 (this review) | 384x288, 12 μm | 19 mm F1.2 | ≤20 mK | 1100 yd / 165 yd | 2 rechargeable CR2 + charger | around $1,100 |
| FMP13 (Black) | 256x192, 12 μm | 13 mm F1.0 | ≤25 mK | 740 yd / 110 yd | 2 non-rechargeable CR2 | around $650 |
Specifications are InfiTac's (FML19 product page and Fast Mini comparison table); the FMP13 row comes from our InfiTac FMP13 review, which has the full FMP13 owner record.
What owners report
All 9 OpticsPlanet reviews give four or five stars (eight five-star, one four-star), and all nine say they would recommend it. Eight carry a Verified Owner tag; the most helpful review, shown in a separate box, has no tag visible. The dated reviews run from January to September 2026, so this is a short, recent record.
Size and weight come up most: six of the nine reviewers call it compact, small or light. Ease of use is next: one reviewer calls it easy to use, another lists the touchscreen as a pro, and a third singles out the interface.
“The best thing is that its user interface is super easy to use.”
John Ops (FL), verified owner, via OpticsPlanet
Offset mounts and stacked sights, not pistols. No reviewer describes a pistol setup. Two use an offset mount (one on a PSL rifle set up with a Sig Tango 1-10x), and two mount it in front of another sight: an EOTech in one case, a red dot for hog hunting in the other. The most helpful review is direct about both sides:
“If you are thinking of mounting this on a pistol, I dont think its worth it. For a cqb or short rifle, this thing is absolutely perfect.”
The Cowboy, most helpful positive review, via OpticsPlanet
“The FML19 is on a 45 off set on the left side to avoid brass.”
ZH (UT), verified owner, via OpticsPlanet
Zoom and distance. One owner who hunts coyotes at 50 to 70 meters notes how the default magnification and the first zoom step behave:
“0.5x is the default, and 1x zoom still provides more than useful information.”
John Ops (FL), verified owner, via OpticsPlanet
Range: what you can see versus what owners use
InfiTac lists a detection range of 1100 yd (1000 m) and a recognition range of 165 yd (150 m), with a focus range from 2 yd to infinity. Owner distances are shorter than the detection figure: one uses it for 50 to 70 meter coyote hunting, one lists "Thermal hunting within 300 yards" as its best use, and the most helpful review says it works from 50 ft to 400 ft. That same review explains why it prefers the sight from 50 ft and out:
“The screen is small, fov is small as well”
The Cowboy, most helpful positive review, via OpticsPlanet
The honest catches
Battery. InfiTac rates one rechargeable CR2 at up to 5 hours and says to use a 3.7V CR2 rechargeable battery to power the FML19; two come in the box with a charger. InfiTac's Fast Mini series FAQ mentions a USB-C input for an external battery pack. One reviewer lists "short battery life" as a con, while another lists "Rechargeable Batteries" as a pro. One caution on InfiTac's own wording: its Fast Mini series FAQ, written for the series, says the Fast Mini comes with non-chargeable batteries, which matches the FMP13 but not the FML19 page's rechargeable CR2 and charger, so confirm the batteries in your box. With one battery in the sight at a time, plan on carrying the spare.
Mounts and a cover cost extra. The box includes an RMR pistol adapter; on a rifle you need one of InfiTac's separately sold mounts or another mount. One reviewer lists "only rmr footprint mount included" and "cover sold separately" among the cons, and a second ends their review with "instead include a cover."
Close range and a small view. The 1.4 inch screen and the 13.8° x 10.3° field of view suit close work, and InfiTac's recognition range is 165 yd. One reviewer lists "Zoom not enough for extremely long range shooting" as a con.
Not a daytime red dot. InfiTac's FAQ on the FML19 page says the Fast Mini optic is designed primarily for low-light and nighttime conditions and does not have a regular red dot daytime function like traditional optics.
A first-thermal caveat. The only four-star reviewer had not yet used it on site, notes having no frame of reference, and reports this:
“sometimes known warm objects will shine at an angle and then blend with the enviroment.”
tony k (WA), verified owner, via OpticsPlanet
One more reviewer lists price as the con. For toughness, InfiTac lists IP67 to 33 ft (10 m), a maximum recoil of 1200 g/s² and an operating range of -4°F to +122°F. Its Fast Mini series FAQ, written for the series rather than the FML19 alone, says the Fast Mini endured two chest-high drop tests from 5 feet and was recoil-tested on firearms including a SCAR MK17, a Desert Eagle .50 and an AR10 .308. Those are InfiTac's own test claims.
Trade-offs, plainly
- It is a close-range thermal. InfiTac's recognition range is 165 yd; owners describe 50 to 70 meters, within 300 yards and 50 ft to 400 ft.
- The screen is 1.4 inches and the field of view 13.8° x 10.3°; the most helpful review calls both small.
- One rechargeable CR2 runs it for up to 5 hours per InfiTac; one reviewer lists short battery life as a con.
- Rifle mounts and the protective cover are sold separately; the box includes an RMR pistol adapter.
- It is not a daytime red dot, per InfiTac's FAQ.
- The owner record is 9 reviews, all four or five stars, and every dated one is from 2026, which is thin for a sight at this price.
Key specifications
| Model | InfiTac FML19 (InfiTac: thermal pistol sight; OpticsPlanet: thermal imaging rifle scope) |
|---|---|
| Version carded | New FML19, MPN FML19, Black (the OpticsPlanet listing) |
| Sensor | 384x288, 12 μm pixel pitch |
| Lens | 19 mm, F1.2 |
| NETD | ≤20 mK |
| Refresh rate | 60 Hz |
| Magnification | 0.5x base; digital zoom 1x, 2x |
| Field of view | 13.8° x 10.3° (H x V) |
| Focus range | 2 yd to infinity |
| Display | 1.4 inch, 360x300 (OpticsPlanet's spec table lists 384x288) |
| Detection / recognition range | 1100 yd (1000 m) / 165 yd (150 m) |
| Color palettes | White Hot, Black Hot, Red Hot, Rainbow |
| Reticles | 6 MOA dot; 6 MOA dot and 65 MOA circle; 6 MOA dot and 130 MOA circle |
| Controls | Touch screen (can also operate using buttons); wakes on motion via an integrated gyro and accelerometer |
| Power | 1 x rechargeable CR2 battery, up to 5 hours runtime; InfiTac says to use a 3.7V CR2 rechargeable battery |
| Footprint | Standard RMR |
| Max. recoil | 1200 g/s² |
| Waterproofing | IP67, 33 ft (10 m) depth |
| Operating temperature | -4°F to +122°F (-20°C to +50°C) |
| Weight | ≤4 oz (113 g) |
| Dimensions | ≤2 x 1.5 x 1.7 in (50 x 38 x 44 mm) |
| Warranty | 3-year limited warranty; register for an extra 6 months (InfiTac) |
Specifications are InfiTac's, from its FML19 product page; the "Model" row also names the OpticsPlanet listing category and the "Version carded" row is the OpticsPlanet listing's. No editorial award is claimed.
Should you buy it?
- Buy it if you want a light thermal on a rifle offset mount or ahead of an EOTech or red dot, as owners describe, for close-range work such as hogs, coyotes or pest control, and you want the 384x288 sensor over the FMP13's 256x192.
- Save with the FMP13 if the same form factor at a lower price matters more than resolution and range: read our InfiTac FMP13 review.
- Look at a full-size thermal scope if you need to identify game well past 165 yards. The best thermal scope guide ranks the field.
- Choose a clip-on if you want to keep your day scope and its reticle: see best clip-on thermal.
- Skip it if you want a daytime pistol red dot. Start with our best pistol red dot guide instead.
FAQ
Is the InfiTac FML19 a pistol sight or a rifle scope?
InfiTac sells it as a thermal pistol sight and describes it as a multi-function thermal pistol/rifle sight; OpticsPlanet lists it as a thermal imaging rifle scope. It ships with an RMR pistol adapter, and InfiTac's own FAQ says you can use one of its Picatinny mounts to put it on a rifle, standing alone or at a 45-degree angle. No OpticsPlanet reviewer describes a pistol setup; the setups they describe include a PSL rifle, offset mounts and mounting it in front of an EOTech or a red dot, and the most helpful review advises against putting it on a pistol.
Is the FML19 2x magnification?
No. The retailer's listing title says 2x19mm, but OpticsPlanet's own spec table and InfiTac both list 0.5x magnification. InfiTac lists digital zoom steps of 1x and 2x, and the 19 is the 19 mm F1.2 lens.
How long does the FML19 battery last?
InfiTac lists one rechargeable CR2 battery with up to 5 hours of runtime, and its FAQ says the FML19 comes with two rechargeable CR2 batteries in the box. InfiTac's spec list says to use a 3.7V CR2 rechargeable battery to power it. InfiTac's Fast Mini series FAQ adds a USB-C input for an external battery pack. One of the nine OpticsPlanet reviewers lists short battery life as a con; another lists rechargeable batteries as a pro.
How far can you see with the FML19?
InfiTac lists a detection range of 1100 yd (1000 m) and a recognition range of 165 yd (150 m). Owners describe shorter working distances: one used it for 50 to 70 meter coyote hunting, one lists thermal hunting within 300 yards as its best use, and one says it works from 50 ft to 400 ft. The same reviewer who uses it within 300 yards lists zoom not being enough for extremely long range shooting as a con.
What is the difference between the FML19 and the FMP13?
Both are InfiTac Fast Mini thermal sights on the RMR footprint. On InfiTac's comparison table the FML19 has a 384x288 sensor behind a 19 mm F1.2 lens, NETD of 20 mK or less and 1100 yd detection; the FMP13 has a 256x192 sensor behind a 13 mm F1.0 lens, NETD of 25 mK or less and 740 yd detection. The FML19 comes with rechargeable CR2 batteries and a charger; the FMP13 comes with non-rechargeable CR2 batteries. The FML19 costs more.
Can you use the FML19 as a daytime red dot?
Not as a regular red dot. InfiTac's FAQ on the FML19 page says the Fast Mini optic is designed primarily for low-light and nighttime conditions and does not have a regular red dot daytime function like traditional optics.
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