IN Brief:
- The US Air Force has opened market research for a ground-based medium-calibre gun weapon system.
- The requirement covers subsonic cruise missiles and UAS Groups 1–5, with lethality, magazine depth, sensing, mobility, and cost among the trade areas.
- Industry responses are due on 9 October, and the notice is an RFI rather than a procurement or contract award.
The US Air Force has asked industry for information on a ground-based medium-calibre gun weapon system intended to provide persistent defence against airborne threats including subsonic cruise missiles and unmanned aircraft across UAS Groups 1 to 5.
The Air Force Life Cycle Management Center’s C3BM directorate issued the request for information on 3 September, with industry responses due by 9 October. The notice is a market-research exercise rather than a request for proposals and does not commit the service to buy a system.
Instead of nominating a particular gun, calibre, ammunition type, radar, or vehicle, the Air Force has defined a set of operational and technical attributes for potential suppliers to address. The approach leaves room for different combinations of effectors, sensors, ammunition, and command-and-control equipment while giving the service a common basis for comparing them.
The notice identifies 15 baseline requirements and additional trade areas. These cover probability of kill, engagement range, elevation, magazine capacity, sustained operations, integrated sensing, interoperability, manpower, built-in test, transportability, safety, and operation within a wider multi-domain defence architecture.
Economics sit close to the centre of the requirement. Guided missile interceptors provide reach and performance against demanding aerial threats, but repeated use against comparatively inexpensive drones can produce an unfavourable cost exchange and exhaust limited magazines. Medium-calibre guns offer shorter engagement ranges but can carry and replenish larger quantities of ammunition at lower cost per shot.
The Air Force has deliberately avoided fixing the calibre at the market-research stage. Ammunition choice will influence lethality, effective range, recoil, magazine size, fuze technology, turret mass, vehicle requirements, and the number of rounds needed for a credible engagement. Suppliers are therefore being asked to balance gun performance against munition cost rather than optimise either in isolation.
Fire control will be equally important. A gun intended to engage small unmanned aircraft or a fast, low-altitude cruise missile needs sufficiently accurate target tracks to place rounds into a useful intercept volume, particularly where engagement windows are short. Radar, electro-optical sensors, radio-frequency detection, or external cueing can all contribute, but each adds cost, power demand, integration work, and maintenance.
A self-contained weapon with organic sensing can deploy without relying on established base infrastructure. Connecting the gun to a wider sensor and command network can reduce duplication and expand its available picture, but only if interfaces, track quality, latency, and communications remain reliable under operational conditions.
Magazine depth changes the calculation again. A point-defence system intended to remain effective through repeated raids needs enough ready ammunition to avoid becoming unavailable after a small number of engagements. Reloading time, crew requirements, storage, ammunition handling, and resupply therefore sit alongside rate of fire and accuracy in determining sustained defensive capacity.
The Air Force has also emphasised rapid deployment. A system designed solely around a fixed installation can accommodate heavier sensors, ammunition stocks, shelters, and power equipment, but dispersed operations require a weapon that can be transported and established without an extensive engineering footprint.
Those constraints tend to work against one another. More ammunition improves persistence but adds weight; larger sensors improve detection but increase power and transport requirements; greater engagement range can require heavier guns or more sophisticated ammunition. The market survey is designed to expose those engineering trades before the Air Force settles on an acquisition approach.
The requirement sits alongside wider Air Force work on installation point defence. Air Combat Command has been testing layered approaches to threats ranging from small unmanned aircraft to cruise missiles, combining electronic warfare, kinetic systems, sensors, command arrangements, and passive defence measures.
A gun would occupy one layer within that architecture rather than replacing every other counter-UAS or air-defence effector. Electronic attack can defeat some remotely controlled or navigation-dependent aircraft, while missiles remain suitable for threats that exceed gun range or performance. Cannon systems are being examined for the engagement space where relatively low ammunition cost and deep magazines can offset their shorter reach.
Sustainment will ultimately influence whether an offered system can provide persistent defence rather than a successful demonstration. Barrels, ammunition, sensors, power systems, vehicles, test equipment, spare parts, and trained crews all have to remain available through repeated operations, while the system needs enough built-in test and maintenance support to return to service quickly after faults.
The RFI remains an early acquisition step, and no procurement quantity, programme value, or preferred supplier has been established. The 9 October responses should give the Air Force a clearer view of what industry can already offer, what would require further development, and where the cost of a gun-based solution begins to approach the systems it is intended to complement.
