The device, comprises essentially, on one hand, a casing divided by a transverse wall into two spaces for receiving, one (open towards the front), the pyrotechnic useful charge of the device, and the other (open towards the rear), the explosive mechanical percussion primer for firing said pyrotechnic charge. An anvil projects from the transverse wall of the casing inside the primer housing space. At least one vent is formed in said transverse wall and connects the two said spaces. A portion of the central zone of the transverse wall of the casing is partially cut out leaving at least one portion connecting with the rest of the transverse wall and driven in towards the inside of the primer housing space so as to form an axial protuberance then constituting said anvil. The vents are formed in the central zone of the transverse wall by this driving in of the partially cut-out portion of said central zone.
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