The Gun's Second Act: Airburst and Smart Sights at the Cheap End of Drone Defeat
DroneZone Desk · · 5 min read
We assess that gun-based defeat has returned from supporting role to structural necessity at the bottom of the counter-drone stack. The driver is arithmetic: jamming is cheap per engagement but has a growing coverage gap, purpose-built interceptors are effective but priced for the wrong end of the threat, and small drones are too numerous and too cheap for either alone. Programmable airburst cannon and optically guided small arms occupy the cost band in between — hundreds of dollars per engagement or less, organic to the units being defended, and indifferent to the target's link architecture. The constraint is range, cueing, and debris, which confines guns to the terminal layer. Within that layer, they increasingly set the cost-per-kill benchmark.
The return of the gun to air defense is one of the less predicted outcomes of the drone war. Through the 2010s, gun-based short-range air defense was a shrinking category, squeezed between missiles that reached farther and electronic warfare that promised cheaper engagements. The drone threat reversed the logic from both directions. Jamming fails against autonomous drones and fiber-controlled aircraft, and its coverage gap is growing. Interceptors work but carry per-shot costs that are defensible against a cruise missile and absurd against a three-thousand-dollar quadcopter. Between those poles sits a wide cost band occupied by the oldest defeat mechanism of all: putting projectiles in the airframe's path. The difference is that the projectiles and the sights have become intelligent, and that intelligence is what makes the economics close.
The clearest demonstration came from an unexpected quarter. When Germany delivered Gepard self-propelled anti-aircraft guns to Ukraine — a system withdrawn from German service years earlier — the 35mm cannon with programmable AHEAD ammunition proved well suited to exactly the threat that had embarrassed more sophisticated systems: slow, low, cheap one-way attack drones. Each AHEAD round ejects a cloud of tungsten subprojectiles timed to detonate in the target's path, converting a burst of a few rounds into a lethal volume. The engagement cost is measured in hundreds or low thousands of dollars of ammunition rather than tens or hundreds of thousands of dollars of interceptor. The lesson was not lost on procurement ministries: Rheinmetall's Skyranger family, mounting a 30mm revolver cannon with airburst ammunition on armored vehicles, has drawn orders and commitments from multiple European states, and the wider market for cannon-based mobile air defense is the most active it has been in a generation.
A parallel track runs through the 30-by-113-millimeter class, the ammunition family of the Apache's chain gun, repurposed for ground counter-drone work. Programmable and proximity-fuzed rounds in this caliber, paired with lightweight cannon such as the M230LF, give trucks and fixed mounts a precision airburst capability at modest cost — EOS's Slinger is the fielded exemplar, and Northrop Grumman and others supply the fuzed ammunition that makes it effective. The selling point is identical to the Gepard's: a burst costing a few hundred dollars against a drone costing a few thousand, fired from a platform a maneuver unit or a base already owns or can cheaply acquire. The effective envelope is short — low single-digit kilometers — but the terminal layer is precisely where the jamming gap bites hardest.
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Jamming fails against autonomous and fiber drones, and interceptors are too dear for the cheapest ones. Programmable airburst and optically guided rifles are repricing the lowest layer.