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Firing a 2 inch Gun at 12,500fps

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A gun so small it could hide behind a bullet still packs a real punch when a Phantom camera slows it down to 12,500 frames per second.

Gavin Free and Daniel Gruchy have spent years pointing their high-speed cameras at some genuinely massive firearms, but this time The Slow Mo Guys went the opposite direction. In “Firing a 2 inch Gun at 12,500fps,” the pair load and fire a miniature pinfire novelty gun that measures roughly two inches from muzzle to grip — smaller than plenty of the standard-issue bullets they’ve filmed in past episodes. The result is a close-up study of hammer strike, muzzle flash, smoke, and bullet ejection happening in a fraction of a second, stretched out until every mechanical beat is visible.

• The firearm in question is a roughly two-inch pinfire novelty gun, not a military-grade weapon — Gav notes it’s smaller than many standard bullets.
• Free and Gruchy shot the sequence on a Phantom v2640 high-speed camera running at 12,500 frames per second.
• Gav warns viewers not to mess around with pinfire guns at home, joking that something this tiny can still deliver a real “owwie.”

A Tiny Gun, a Big Camera

The Phantom v2640 is the workhorse behind most of the channel’s ultra-slow-motion work, and here it’s tasked with resolving a mechanism that’s barely visible to the naked eye in real time. At 12,500fps, a firing sequence that would normally register as a single flash and bang gets broken into thousands of individual frames — enough to watch the hammer fall, the pinfire cartridge ignite, and the tiny bullet clear the barrel in distinct, separate stages.

That kind of frame rate is standard territory for Gav and Dan, who’ve used similar Phantom setups to dissect everything from full-size firearms to fireworks. The novelty here isn’t the technology; it’s the subject. Pointing a camera built to capture military-scale ordnance at a two-inch novelty gun flips the usual scale of their content on its head.

Size Defines the Core Narrative

Gav is upfront in the video that this isn’t the kind of hardware seen in the channel’s other firearms episodes, like the sniper-adjacent content covered in Marine Corps Scout Sniper Course: Cover and Concealment. A pinfire gun is a small-scale, low-powered novelty firearm that uses a pin-based ignition cartridge rather than a modern centerfire round, and this particular example is small enough to nearly disappear in an adult hand.

Do not mess around with pinfire guns at home. You could get a tiny but very real owwie.

That line sums up the entire premise of the video: small doesn’t mean harmless. Even at a fraction of the size and power of the guns the channel has filmed before, the pinfire cartridge still produces a visible muzzle flash, a puff of smoke, and enough force to eject the bullet with real velocity — all of which the slow-motion footage captures in detail most viewers have never seen from a gun this size.

Slow Motion Footage Reveals Details

Slowed down to 12,500fps, the mechanical sequence becomes almost delicate: the hammer’s strike on the pinfire cartridge, the ignition point, and the brief expansion of gas and smoke before the bullet leaves the barrel. It’s the same kind of mechanical curiosity that’s made the channel’s other technical breakdowns popular, whether they’re examining firearms or filming animal behavior up close, as in Filming The World’s Deadliest Bird. The appeal isn’t the danger — it’s watching an ordinary, fast event get pulled apart frame by frame.

The pinfire gun never had a chance to look intimidating next to the artillery-scale weapons The Slow Mo Guys have tackled before, and that’s kind of the point — Gav spends half the video grinning at how something this small still makes a legitimate bang at 12,500 frames per second.

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