This is for 5.56 URX only. We do not work on 308/7.62 KAC products. If you send a complete upper with a URX HG, which needs to be disassembled then reassembled you need to select this service. If we are swapping the URX in place of a standard handguard, you only need the standard diss-reass service to install the URX. This service is for removing a URX handguard. This service does not include installation of new/swapped FSBs onto undrilled barrels.