eBaybanned is selling this M4 Flashhider which looks similar to the First Factory or AZR models. Almost like having a rebar cutter at the front end, this flash hider has been the favourite of players who do some custom "zombie killer" M4 airsoft rifles.  This type of flash hider is sometimes hard to find, as I for one have been looking around, and it's not always available. I guess eBaybanned knows about this predicament and found one for me. Costs US$39.40 shipping included.