Lots of choices for tracer units with muzzle flash generators these days from different companies and that is always a good thing. The latest in the airsoft market is the Ferfrans CRD-Style Flame Tracer Unit from Ace1 Arms. TactiCool开箱哥 does an unboxing and quick review of this unit... "A1A CRD Flame tracer, lock/detach feature was replaced by power on/off and mode switch function, 3 mode: Flame / Flame + Tracer / Tracer only, Overall is good, except usb charging cable in box was too fat to fit."