Quote Originally Posted by electronman1729 View Post
Is the blow gas in the face any different between the two?
I?ve been through several barrels in both lengths. Gas in face is mostly port size, charging handle, suppressor, and timing. I prefer 12.5 with carbine gas. The difference with the other variables optimized is small. Now 10.5 starts to get sporty as you start to get noticeably less flexibility in tuning.

12.5 is the shortest I will go with a K type suppressor. 11.5 gets a full size. Something to consider. For reference, I don?t do brakes on barrels under 14.5 without a suppressor.