Home Forums Hunting & Shooting AR and Tactical Rifles Thinking about a 6.8 SPC upper,what do I need to know?

Are you saying that there are a lot of manufacturers making Grendel barrel with bad chamfers since 5.56s, 6.8s and 308s never have that bulge?

How about this chamfer would it make an unsupported area ? Nope none of these are mine either. Not the CSS, Not the AA, not the Compass Lake Mike Rocks. https://www.youtube.com/watch?v=Ru-ZiaEQNMs

what about these?-







Did you look at the photo of the 2 sectioned cases? Can you explain the difference? What is the max operating pressure of a 220 Russian? 6.5 Grendel?