NP3 is a Teflon/Nickel hybrid finish. The advantage over hard chrome is its increased lubricity - far less oil and grease required. The advantage of hard chrome is its hardness. If your weapon is exposed to SERIOUS hard wear, then hard chrome might be the better choice. Personally for me, I prefer NP3. It is the bridge in wearability between today's baked on/sprayed on finishes and hard chrome. Plenty hard for me and grease and sludge seem to roll right off it. I also think it is very aesthetically pleasing and coats a gun more uniformaly.