FIELD: sighting devices, in particular, bore-sighting devices of aircraft artillery. SUBSTANCE: when a bore-sighting gauge is installed in the a bore voltage is applied to winding of signal relay 22, pin part of connector 23 is connected to mating part located on the weapon. When firing button 25 is pushed circuit breaker 26 gets actuated and it prevents a shot. EFFECT: enhanced safety of adjustment fire when bore-sighting gauge in the bore. 2 dwg
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