G&G tracer unit silencer for trace bbs

New aluminum hi quality and technology model 
internal tracer spot light that only flash at bbs transit
internal lithium battery and charger are included
raer led indicator to immediately shows the status of the battery
metal thread to install on 14mm left gun barrels
compatible with g&g, marui, ka, vfc, jg, dboys etc...
length; 185mm
diameter: 38mm