If you plan on buying a new BCG, Duffy’s FCD NP3 one is awesome. Its going in all my new “builds”. I’m not sure about NP3 vs nitride for corrosion resistance, but it should beat phosphate.
Since you might be buying a trigger, coated triggers such as ALG ACT or Sionics two stage might be worth looking at. I’ve found corrosion on engagement surfaces to be a problem with regular “mil spec” triggers. I haven’t gotten my G SSA wet yet, so I don’t know how it would hold up.
I imagine the stock BCM gas tube would be as resistant as any.
Can we assume you are using a regular stainless action spring with stainless spring mags?
I plan on testing a few sets of lower springs for saltwater corrosion resistance, including that inconel set, which I’ll order tonight. I picked up one of the other sets for comparison today. I’ll let you know how it works out.
RLTW
Former Action Guy
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
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