Rheinmetall formally opened its UK Gun Hall in Telford on October 22, restoring a domestic manufacturing capability for large calibre weapons that the British Ministry of Defence says had been absent for two decades. The facility makes barrels and breeches for 120mm and 155mm systems.
The opening ceremony marks an industrial milestone, but it was not the first day of manufacturing. In its opening announcement, Rheinmetall says breech and breech block production began in May 2026, followed by barrels in June.
Capacity is different from output
The company puts peak annual capacity at up to 245 barrels across the two calibres, plus more than 50 breeches. Those figures describe what the facility can produce at peak capacity, rather than a verified total already delivered to armed forces.
The 11,500 square metre production space is intended to support Challenger 3 and future artillery platforms. The ministry also names RCH 155 among the systems supported, connecting the plant to both tank armament and artillery requirements.
Employment is also set to develop in stages. Rheinmetall reports 35 people currently at the gun hall and expects more than 100 as production grows; Telford & Wrekin Council's account similarly describes around 100 roles as a future outcome of expansion.
British production with German expertise
The ministry says British employees trained at Rheinmetall's Unterlüß facility in Germany before returning to Telford. Their training covered precision manufacturing, quality assurance and specialist weapons production, transferring practical knowledge as well as installing machinery.
Both the government and company connect the project to the Trinity House Agreement signed by Britain and Germany in October 2024. Domestic production in this case is being rebuilt through an industrial partnership with a German supplier.
Rheinmetall also plans to introduce steel from Sheffield Forgemasters. That is a stated next step in the supply chain, not confirmation that every barrel now being manufactured already uses British steel.
Replacement capacity becomes a military requirement
In his speech at the opening, British Army chief General Sir Roly Walker argued that armed forces must be able to repair and replace fighting systems at the rate war consumes them. His point connects factory capacity to sustained readiness, rather than simply to the delivery of new equipment.
Barrels and breeches are components, so their production should not be read as an equivalent number of complete tanks or artillery systems. Likewise, the announced capacity does not establish how many finished weapons will reach British units in a particular year.
The immediate change is that Britain again has a working domestic site for these manufacturing processes. Its longer term military contribution will depend on orders, production ramp up and delivery, while the announced staffing and steel plans show which parts of that expansion remain ahead.