Anyone have any experience with Stag Arms Nickel Teflon BCGs?

[drumvudu]

I am going to purchase two Bolt Carrier Groups in the next few days. I have several already but I saw these nickel teflon units and they look interesting. Anyone have one or know anything?

https://www.stagarms.com/nickel-teflon-coated-bolt-carrier-assembly-right-handed/