Modern illegal activity is becoming more and more organized, there is professionalism and specialization of these crimes. Wide practice has received use in affordable purposes of self-made explosive devices, grenades, grenade dispenser, mines and rounds. In view of the given, there is no doubt the relevance of optimization of the first stage of investigation of illegal manufacture, processing or repair of firefighters or falsification, illegal removal or change of its marking, or illegal manufacture of ammunition, explosives or explosive devices, separate typical investigation situations and versions. The purpose of the article is to separate the most typical investigative situations that arise at the initial stage of investigation of crimes envisaged by the Art. 263-1 CC of Ukraine, and elaboration of an algorithm of actions of authorized subjects concerning their solution. The combination of methods and methods of scientific knowledge is used to allocate typical investigative situations at the initial stage of investigation of the defined crimes, provided by Art. 263-1 CC of Ukraine, and the allocation of corresponding versions. On the basis of separate typical investigative situations of the initial stage of investigation of these crimes, typical investigative versions are proposed, which should be proposed and tested with regard to: the way of committing the crime; the person of the offender; the community; the introduction of other crimes, in particular those committed by means of the application of detected weapons, etc., is emphasized on the special urgency of the comprehensive application of appropriate unspoken investigative (search) actions and separate measures to ensure criminal proceedings – temporary access to property and documents, temporary removal of property, and arrest of property