Patrol Base goes over the T238 RGB Rainbow Tracer Unit, which is an alternative to the Acetech Bifrost for airsoft shotguns with Stu talking about is features and compatibility... "Are you curious about what airsoft guns the new T238 Tracer fits on? Well we sat Stu down with the CYMA SGR-12 and the Golden Eagle Type 870 M8879 Gas Shotgun to show where the tracer unit will fit and where it won't so you won't be left out of tracer fun at your next airsoft battle."