Abstract: A primer (10, 210, 310, 410, 510, 610) for firearms comprises a cap (11, 211, 311, 411, 511, 611) containing an explosive mixture (12, 212, 312, 412, 512, 612). In proximity of the peripheral edge of the bottom of the cap there is an element (13, 213, 313, 413, 513, 613) for radial reduction of the inner space of the cap intended to be filled with the mixture, to reduce the volume of the space available for the mixture by a selected amount. The mixture is advantageously free of heavy metals and can advantageously contain diazodinitrophenol. The presence of the element for the radial reduction of the inner space of the cap makes it possible to adjust characteristics of the mixture, thus improving the characteristics of the primer.

Abstract: A priming mixture comprises aluminium silicate as the sensitizer, advantageously in a percentage higher than 10%, not exceeding 30% and preferably included between 15% and 25%. Combined with said sensitizer, the-mixture may further comprises a potassium compound, preferably potassium nitrate.

Abstract: A priming mixture comprises aluminium silicate as the sensitizer, advantageously in a-percentage higher than 10%, not exceeding 30% and preferably included between 15% and 25%. Combined with said sensitizer, the-mixture may further comprises a potassium compound, preferably potassium nitrate.