AGM Rattler V2 25-256 Thermal Riflescope — 256x192, 25mm, 3.5-28x

The AGM Rattler V2 25-256 is the scope most hunters actually start thermal with. It is a dedicated weapon-mounted thermal sight — not a handheld scanner — built around a 256x192 core and a 25mm germanium objective. It sits at the price point where thermal stops being an aspirational purchase and becomes a tool bought for a specific job: coyotes on a night stand, hogs working a field edge, predators inside a few hundred yards.

What A 256x192 Core Actually Buys You

The 256x192 detector at a 12µm pixel pitch is the entry tier of modern thermal, and being straight about that is more useful than overselling it. What it gives you is a genuinely readable image on a game-sized heat signature inside a few hundred yards — enough to find an animal, confirm what it is, and make a clean shot at realistic night-hunting distances.

AGM rates detection at 1,250 yards on a six-foot object. Detection means "something warm is out there," not "that is a coyote and it is quartering away." Identification on a predator-sized animal lands far closer than the headline number. Plan around a couple hundred yards and the scope will not disappoint you.

The 35mK NETD rating is what keeps an entry-level core workable. NETD measures the smallest temperature difference the sensor can resolve, and lower is better. At 35mK the Rattler V2 holds a usable picture in the conditions that flatten cheaper thermal — humid nights, ground still radiating the day's heat, light drizzle where everything in frame is drifting toward the same temperature.

The 50Hz Refresh Is The Real V2 Upgrade

The original Rattler ran a 25Hz sensor. The V2 doubles that to 50Hz, and on a weapon-mounted optic that single change matters more than anything else on the spec sheet. At 25Hz, panning across a field smears and a running hog turns into a comet tail. At 50Hz the image tracks with the rifle, which is the difference between swinging on a moving animal and guessing where it went.

Base magnification is 3.5x, stepping digitally to 28x. Treat 3.5x as your working power. Digital zoom on a 256 core magnifies pixels rather than revealing detail, so the upper end is a confirmation tool, not a reach extender. The 7.0° x 5.3° field of view works out to 37 feet at 100 yards — narrower than the 19mm Rattler, which is the trade you make for the added magnification and the longer detection range.

Field Practicalities

Power is the quiet headline. The replaceable NE-4400 lithium-ion pack runs up to 11.5 hours and two batteries ship in the box, which is enough to hunt dark to dawn twice over without touching a charger. USB-C external power keeps a long sit going off a power bank.

Shot Activated Recording starts video with sound on recoil, so the footage exists whether or not you remembered to hit record — which, in practice, you did not. Recording writes to 16GB of internal storage, and Wi-Fi hotspot connectivity streams to the AGM app for review or sharing.

Ten reticle patterns in four colors, plus multiple zeroing profiles, mean one scope moves between rifles without re-zeroing from scratch. The raised five-button layout is designed to be worked with gloves on, which matters at 2 a.m. in February. At 1.08 lb the scope does not unbalance a lightweight rifle, and IP67 sealing with a -30°C to +55°C operating range covers any night you would reasonably be out in.

Key Specifications

• Type: Weapon-mounted thermal riflescope
• Thermal Sensor: 256x192, 12µm VOx uncooled focal plane array
• NETD: 35mK
• Objective Lens: 25mm F/1.0 germanium
• Magnification: 3.5x base, up to 28x digital
• Field of View: 7.0° x 5.3° (37 ft at 100 yards)
• Detection Range: Up to 1,250 yards on a six-foot object
• Refresh Rate: 50Hz
• Display: 0.39-inch 1024x768 OLED
• Color Palettes: White Hot, Black Hot, Red Hot, Fusion
• Reticles: 10 patterns, 4 colors, multiple zeroing profiles
• Battery: Replaceable rechargeable NE-4400 Li-ion, up to 11.5 hours, two included
• External Power: 5VDC 2A, USB Type-C
• Storage: 16GB internal, Shot Activated Recording with sound
• Connectivity: Wi-Fi hotspot, AGM app
• Eye Relief: 45mm
• Weight: 1.08 lb (0.49 kg) without mount
• Weather Rating: IP67
• Operating Temperature: -30°C to +55°C (-22°F to 131°F)

Worth Knowing Before You Buy

Mount configuration has changed across production runs. Earlier Rattler V2 units shipped with an ADM quick-detach mount, while current AGM listings specify a standard Weaver-style mount instead. If quick-detach matters to your setup, confirm what is in the box before you order rather than assuming.

The 256 core is the entry point of the line, and it is worth being honest about where its ceiling is. If you expect to identify game past a few hundred yards, or you hunt heavily wooded country where partial heat signatures are the norm, step up to the 25-384 or 35-384 instead. The money buys real resolution, not marketing.

Finally, check your state regulations before mounting thermal on a rifle. Rules on thermal and night hunting vary sharply by state and by species — many states that permit thermal for predators and hogs prohibit it outright for big game.