In between classes at the moment, I'll try to elaborate more later, but I'll say that it's probably not very cost effective to have two tooling setups for a "high end" and "eco" line. Therefore internals should all be the same just externals might be different (ie. ambi selector on Knights series from VFC vs none on the regular "E" series).
Take for example the VFC PDW, there is a standard version and a DX version, the standard doesn't have as much cool stuff but the DX includes rail covers, battery box, KAC PDW Suppressor, KAC Vert Grip, extra inner barrel (and inner barrel extension for 8 inch or 10 inch), etc.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE