Grayburn: The UK’s Future Small Arms Requirements

Overview This paper is a pivotal analysis of the British military’s requirements for a new standard rifle, shaping the future of UK defence capability and operational effectiveness. It delivers actionable insights for defence professionals, policymakers and industry stakeholders by evaluating the trade-offs and design priorities necessary to replace the ageing L85A3 service rifle. Key Recommendations - Prioritise operational requirements over NATO standardisation: The UK should select rifle calibre and design based on its own tactical needs, rather than aligning with diverging NATO standards. - Optimise for suppression at 400 m and lethality within 150 m: The new rifle must reliably suppress targets at longer ranges and deliver decisive effects in close combat, reflecting modern battlefield realities. - Balance kinetic performance, accuracy, ergonomics and capacity: No single rifle can maximise all attributes. The chosen design must carefully weigh trade-offs to suit complex terrain, closed positions and vehicle operations. - Ensure reliability and maintainability: The rifle should be robust, simple to maintain and suitable for rapid scaling in wartime, with sovereign UK manufacturing capacity for both weapon and ammunition. - Tailor accessories and barrel lengths for different user groups: While the base rifle should meet close combat requirements, modularity allows adaptation for the Royal Navy, the RAF, Cadets and non-combat arms. - Address legal and ethical considerations: Performance requirements must be determined first, then reviewed for compliance with international humanitarian law, especially regarding ammunition types. - Communicate trade-offs transparently to users: The British military must clearly explain the rationale behind design choices to build confidence and ensure the rifle fits within a coherent combined arms system. This research, grounded in recent combat data and expert interviews, provides a comprehensive framework for selecting a new service rifle that will underpin the UK’s future fighting capability. It is essential reading for those shaping defence procurement and operational doctrine.