Powder Coating bbl action?

[Black Diamond 408]

Roy:

My finish of choice for metal has been the "Gun Kote" The only way you get it off is to sandblast it. You can run it through a air brush, camo patterns as well. 300 deg in a oven for 1 hour is the cure time. I have done several 45 autos, rifle actions, works good and is very abrasive resistant. You can get it in almost any color.
Gun Kote website

On stocks i like to use the Wrinkle Paint, very durable, just takes about two weeks to cure out properly.

Its all fun tring to come up with new styles and designs.

[Buffalobob]

these people are connected to 1000yd bench rest shooting so you might check with them being as they specialize in powder coating

McRees

[Pete Lincoln]

450F is about 230C you should be ok on barrels at that, but i wouldn't go much higher.
I was looking into exactly this subject about 1 year ago when searhcing for different coatings to offer on my custom rifles.
I currently have a company who do me TiAIN applied at 200C.
I also have chrommoly actions Nitride treated accasionaly.
I got a bog box of cerakote in a few weeks ago and will also be using that. gunkote works but isn't all that tough.
regards Pete