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With the GBBRs...it's worth giving serious consideration to having steel components run/bear/actuate against steel components (or alum vs. alum...like against like).
Steel will quickly wear out pot metal or alum parts. For example....the sear catches of a pot metal/alum hammer will be easily worn by a steel sear.
That said...also consider what parts would fail...and it may be preferable to have one specific part fail vs. another (i.e. I'd rather bust a nozzle vs. bolt carrier....I'd rather the nozzle tip went vs. the nozzle body....etc...)
Once the accelerated wear aspect is dealt with...there's also the durability aspect. GBBRs take quite a pounding internally. There's big chunks of metal cycling very quickly inside and this generates a lot of force.
It's "simpler" to say...go steel for everything...but that may not be the be all and end all depending on what you want to achieve.
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