Great info, thanks! I really appreciate you taking the time to get legitimate temperature readings. I don't suppose you've ever taken readings on the DD rail it replaced under similar conditions, have you?
Interesting. Are the profiles the same/similar or different? Is your rate of fire the same, or do you shoot the stainless barrels at a slower pace? I could see how you might shoot a stainless barrel less or slower at a range if it was more of a precision set up compared to your steel barreled guns.
I was looking at NSRs online yesterday and one site I found them in stock at mentioned that an internal heat shield was supposedly in the works that would attach between the barrel and the NSR somehow without using any of the keymod holes. They failed to mention who was developing said device, or when it would be available, so I'm a little skeptical. But it did get the gears in my head turning... there's got to be some way to funnel at least some of that heat away from the rail and out the front...

