Originally Posted by
Unicorn
Even one of the top people at Spike's has said somewhat publicly (on that other AR forum) that he's experienced it with HIS company's NiB bolt groups.
Basically you need to wipe it down at the end of every shooting day. Sure something that should be done regardless, but doesn't match how these are usually marketed. And not always something that happens when talking about a worn out, end of 16 hour patrol, grunt.
There are maybe three coatings I'd consider. Microslick from Cerakote, NP3 or NP3+, and maybe hard chroming.