Lone Peak and Impact compatability

[atombomb]

I was looking at prefits for my Impact action and saw a few sites that listed Lone Peak and Impact barrels together. Are they threaded and headspaced the same?

 

[Sheldon N]

The headspace and thread pattern is the same, all the key dimensions on the chamber guide drawings are essentially identical. I think one has slightly more tenon protrusion by 0.010" but the chamber itself is spec'd the same.

I've personally run Impact barrels on Lone Peak and Lone Peak barrels on Impact without issue, and my actions matched headspace identically. The clocking of the barrel engraving isn't the same, but that doesn't really matter.