The Arcturus Defense Solutions ARC-SL45 is the heavy-caliber variant of the ARC smart-linked platform, chambered in .45 ACP with full BCI integration and an onboard threat assessment system that goes beyond simple ballistic calculation. The weapon's AI-assisted targeting identifies and prioritizes targets based on threat posture, weapon signature, and behavioral analysis — feeding the shooter a ranked engagement queue through their neural interface.

The Kingmaker is not just a smart gun — it is a tactical decision-support system in a pistol chassis. The threat assessment AI monitors a 180-degree forward arc through the weapon's integrated sensor suite, classifying individuals as non-threat, potential threat, or active threat in real time. The shooter sees this classification overlaid on their visual field, with the highest-priority target highlighted. The system can even suggest optimal shot placement based on detected armor coverage.

This level of autonomous threat analysis in a sidearm is controversial even within Arcturus. Internal documents leaked two years ago revealed heated debate among the design team about whether the system's target prioritization constituted an autonomous weapons system — a classification that would trigger international prohibitions. Arcturus maintains that the AI advises but never controls the trigger, a distinction that regulators have so far accepted.