Why U.S. Gatling Guns Are Not Stopping Iran’s Shahed Drones

Why It Matters

C‑RAM’s limited ammo and variable effectiveness expose bases to drone threats, prompting a shift toward more economical, scalable air‑defence solutions.

Key Takeaways

• C‑RAM unit price exceeds $4 million.
• M940 rounds cost $168 each, $25k per burst.
• Magazine holds 1,500 rounds, enough for ~30 one‑second bursts.
• Hit rate drops to 70‑80% against rockets, lower for drones.
• U.S. Army bought 20,000 rounds, depleting in five minutes.

Pulse Analysis

The Centurion C‑RAM traces its lineage to the Navy’s Phalanx CIWS, translating a ship‑based missile‑defence concept into a land‑based, 24‑ton platform designed to protect high‑value assets. Its 20 mm M61A1 Gatling gun can unleash 3,000‑4,500 rounds per minute, but each M940 projectile costs roughly $168, making a single 150‑round burst comparable in price to the very Shahed drones it seeks to destroy. This cost structure, combined with a 1,500‑round magazine that requires a half‑hour reload, forces commanders to weigh firepower against logistical sustainability.

Operational footage from Iraq and Syria shows C‑RAM delivering bursts ranging from one to seven seconds, with hit‑rates that appear strong against rockets and mortars (70‑80%) but falter against low‑altitude, composite‑material Shahed drones. The drones’ minimal radar cross‑section and ability to fly below 100 feet generate clutter that strains the Giraffe 1X radar, sometimes even disabling it, as seen at the Baghdad embassy. Consequently, multiple bursts may be needed to achieve a kill, rapidly draining ammunition and exposing the system to depletion during coordinated drone swarms.

Strategically, the limitations of C‑RAM are prompting a reassessment of point‑defence doctrine. Emerging alternatives, such as low‑cost interceptor UAVs developed by Ukraine, offer a more scalable solution: they can loiter, engage multiple targets, and be replenished at a fraction of the cost of a $4 million gun system. As the U.S. Army procures additional M940 rounds—20,000 this year alone—budgetary pressures and the need for persistent coverage are likely to accelerate the integration of these cheaper, network‑centric air‑defence assets.