Abstract: A perimeter breach warning device includes a main body forming a firing bore therethrough, a holding protrusion at the first firing bore end, a firing pin assembly within and extending out from the firing bore, a primer within the firing bore at the second firing bore end, a safety nozzle, and a trip pin configured to be inserted into the trip pin bore of the shaft such that the spring of the firing pin assembly is compressed, wherein the spring is configured to decompress in response to removal of the trip pin, thereby causing the firing pin assembly to move within the firing bore towards the second firing bore end until the firing pin strikes the primer causing a primer explosion and the external shaft protrusion interfaces with the internal firing bore protrusion causing the firing pin assembly to stop moving towards the second firing bore end.