Jev YTC tries the 5KU Spitfire Mini Tracer unit that is one of the best sellers from 5KU. This tracer unit, apart from illuminating tracer BBs also has a simulated muzzle flash effect. This has a very sensitive motion sensor and the and rechargeable lithium battery can charged with a mini USB cable. It can be fitted on 14CCW threads or 11mm internal thread for pistols.