Despite the fact that sionicsweaponsystems.com looks like it was made by a .js coder on his first trip of cocaine, I'll have to second the suggestion for Sionics' NP3 BCG.
Putting that exact BCG against a similar quality phosphate BCG in identical rifles I noticed carbon deposits took longer to adhere to the NP3 coating, and after cleaning at two thousand rounds on the dot, the NP3 required less of the Michelangelo style chiseling to remove the deposits from angled areas on the BCG.
You will noticed NP3 doesn't hold oil as well as phosphate or NiB, likely due to the extremely smooth surface.
If someone made NP3 bolt carrier assemblies for the SCAR, I'd buy two.
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