The OG-45 offensive hand grenade, and DG-45 defensive hand grenade utilize a steel tube core to harness the effect of “deflagration to detonation transition” or “DDT” to maximize the effectiveness of low-explosives like black powder, pyrodex, smokeless powder, etc. that are safer and easier for the average person to obtain rather than the need for synthesizing more advanced/complicated high explosive materials like PETN, ETN, HMTD, TATP, UREA NITRATE, Comp-B, chlorate/perchlorate based explosives and others. This also eliminates the need for a primary explosive and any boosters you might need for detonating a secondary high explosive.

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