CMMG bore/chamber coating.......

[MIL-DOT]

I was just looking at CDNN's catalogue where they have several AR-15's built by CMMG that have a bore/chamber coated by something called "WASP" that they say is more durable than chrome lining. Though I've long been a fan of CDNN, I'm a bit skeptical of this particular claim, so I thought I'd ask the matrix.

 

[RyanM]

Last I checked, no one knows for sure what it is. I suspect it's iron nitride, the same stuff as Tenifer, Melonite, etc. If so, I think that stuff is tougher than chrome, though I'm not sure what the coefficient of friction is.

 

[FMJMIKE]

I have read that it is the same finish as a Glock handgun.

 

[Z-Michigan]

It seems to be some sort of nitriding process, which would be comparable to chrome in durability. It happens to be a cheaper process, which is why you would see it on their less expensive models.

Glock's Tenifer is also a nitriding process, but there are several different types of nitriding which are not all identical. However, all are very hard and should be durable.