Hello Geez,
I was on an official server. There were not any noticeable desynchronisation going on this server.
However I can precise something : the rifle had ATOG Scope, Standardized Suppressor, M4 Buttstock OE and a fully loaded 30rd Standardized Mag attached to it. (I Don't precise the M4-A1 Rail Handguard because without this one the flashlight can't be attached).
Moreover i'm not actually pretty sure the flashlight disapears 100% of the times.
May this helps you ?
Regards,
Kafune235