The 12.5 GKF (12.5x40.4mm) is a standard issue cartridge distributed across the HFR. It was first developed by Shandong Industries in 2283, as part of the larger standardization program spearheaded by Republic Space Command (RSC, GKF for the pingying acronym) to simplify logistics in the confederacy. Soon after its development, production licenses were granted to multiple space and ground based factories in all three Confederate star systems. The 12.5 GKF is most prominently used by the Q25 Main Battle Carbine, though various local firearm models also use the standard cartridge. Its primarily application is anti-infantry and anti-drone, with minor armor piercing characteristics.
The 12.5 GKF is fundamentally a gyrojet, a solid fuel rocket. The solid propellant is stored inside a soft steel case with angled nozzles, with a pin at the bottom center. The warhead is made of a lead-antimony softcore, spearheaded and wrapped by hardened steel. When a hammer strikes the pin, the propellant ignites, spinning the cartridge and accelerating it forward at the same time. Tests conducted show that the 12.5 GKF reliably pierces environmental suits and suit visors, before tumbling in the human body. However, it is far less effective against top-of-the-line body armor used by elite infantry units of other nations, requiring careful precision to strike weak points, or to switch to a larger caliber bullet altogether.
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