Only kind of, and only with significant modification.
The only thing I can think of that is potentially drop in, is hop up unit, but then you have to use GHK nozzles which is a ballache, because the nozzles need filing down to work with WA BCG's as they're dimensionally too big OOTB. Nozzle guides are also different, can again kind of work with some filing, but nothing is easy.
God forbid you need anything in the FCG, as its a complete shitshow in compatibility, given GHK can't guarantee compatibility between their own QC and generational differences, let alone compatibility with WA.