Tracer units are accessories mounted to airsoft guns that make tracer BBs glow as they are fired. When a BB passes through the unit, it is briefly illuminated by UV light, charging the BB so it glows visibly as it travels through the air.

Most tracer units attach to the muzzle of the airsoft gun in a similar way to a suppressor. Inside the device, a sensor detects the passing BB and activates UV LEDs that illuminate it just before it exits the barrel.

In most cases, tracer units are built into suppressor-style housings, but there are also hop-up units and magazines on the market with integrated tracer systems. In some cases, tracer modules can also be installed into these components afterwards.

Tracer units are especially popular in CQB fields, indoor arenas, and night games, where the glowing BBs make it easier to track shots and adjust aim while also adding a visually striking effect to gameplay.

The selection includes various airsoft tracer units, from compact models designed for pistols to suppressor-style tracer units commonly used on rifles and carbines.