Rock Bottom Airsoft does a comprehensive review of the Bocca Tracer Unit from Nuprol... "In this video we take a look at an affordable Tracer unit for your Airsoft replicas. Including a test fire using it in low light conditions.

Tracer units look cool as an accessory but really come into their own in low light play. Indoor CQB or night games can certainly benefit from a Tracer unit. They allow you to track your shots as well as looking awesome.

The Nuprol Bocca tracer unit is affordable, looks like a suppressor and seems well put together. Here we will have a look at one, show you how to use it on your replica and discuss my impressions of it."