The "NATO Manual of Proof and Inspection AC/225 (LG/3-SG/1) D/8" stipulates each weapon and component considered vulnerable to the effects of a rapid change in pressure, for example barrels, breech blocks and bolts, will be tested by firing one dry round at a corrected minimum of 25% over pressure and one oiled round at a corrected minimum of 25% over pressure. Over pressure of 25% means 25% in excess of the service pressure resulting for the 5.56×45mm NATO up to (Pmax) piezo service pressure. The service pressure is defined as the mean pressure generated by the service cartridge at a temperature of . Such a high pressure proof is conducted with both the weapon and ammunition conditioned to an ambient temperature of . Each weapon will be individually tested, from an ammunition lot that produces a minimum corrected mean chamber pressure. The corrected proof pressure requirement (service pressure (Pmax) + 25%) for the 5.56×45mm NATO like the STANAG 4172 is (PE) piezo pressure. This pressure has to be recorded in a NATO-design EPVAT barrel with Kistler 6215 transducer, HPI GP6 Transducer or by equipment to C.I.P. requirements.