The Tectonic Innovations QUAKE 8 Way Impact Grenade itself is a simple yet effective design. At the top of the Quake is the stainless steel plunger, which upon impact forces itself into the grenade. This then pushes the toughened firing pin into your .209 primer, which is held in place by the aircraft grade alloy multi-shot base. The stainless steel core is then beautifully presented in an anodised alloy casing. After all, what’s the point of an airsoft kit if not to look awesome?