A unique electromagnetic weapon that fires a round containing a compressed data packet — a BCI-readable message encoded in the round's electromagnetic signature that the target's neural interface involuntarily processes on impact. The round delivers both physical damage and an information payload that forces the target's BCI to display a pre-loaded message, image, or data burst.

Ossuary Arms designed the OA-7 as a conceptual weapon — the idea that violence can carry a message is as old as warfare, but the Momento literalizes it. An operator loads a data packet into each round alongside the conventional kinetic payload. When the round strikes a BCI-equipped target, the electromagnetic burst from the impact interfaces with their neural hardware and displays the encoded content whether they want to see it or not.

The weapon has found use in psychological warfare, where the content of the data payload is as important as the physical damage. Threats, warnings, demands, and even advertisements have been delivered via Momento round. The weapon has also been used to deliver malware to BCI systems — a round that hacks as it kills.