Sootch reviews the Robar NP3 Gun Finish. This finish is shown on a Glock pistol and an AR-15 bolt carrier group.
The Robar NP3 finish is an electroless nickel-based finish for steel, stainless steel and aluminum alloys that co-deposits sub-micron particles of PTFE (polytetrafluoroethylene), otherwise known as Teflon, with electroless nickel.