The London Proof House, established in 1637, is a critical facility for ensuring firearm safety in the UK. It tests firearm barrels and complete firearms by firing two specially loaded rounds with 25% more powder than standard. This process, mandated by the Firearm Acts of 1868 and 1978, verifies that components can withstand extreme pressure. The Proof Master oversees operations, while the Master's role is largely ceremonial. Proof marks are applied to components that pass the test, indicating their safety and compliance.
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