Propun această traducere deoarece nu avem un termen perfect echivalent în română.
În principiu, în cadrul „proof house” se testează și se marchează/omologhează armele de foc:

„Proof is the process of testing the safety of a gun barrel. It is still done as it has been since the beginning of gunmaking: by firing the gun with an over-pressure charge of powder.
...
Under the Gun Barrel Proof Act (amended 1978), proof is required for all guns sold in the United Kingdom, and for guns that have undergone structural modifications to their barrels – for example by re-sleeving worn shotgun barrels or adapting a rifle barrel to accept a sound moderator or muzzle attachment. Imported guns also need to be proofed, although that can be done at the proof house in the country of origin...”

http://www.gunmakers.org.uk/proofhouse.html


Eventual poți adăuga „oficial” (dar e clar că omologarea armelor de foc se poate face numai într-un centru oficial).