Quote Originally Posted by MWAG19919 View Post
SOLGW is pretty transparent about their gas port sizes, and they do 0.078" for a 13.7 mid. They don't seem to believe in gassing guns for the bare minimum, instead preferring to design their guns to run when dirty, cold, etc. But still, I think a 0.075" 12.5" mid unsuppressed may be undergassed. According to a few sources, that's a smaller port than my 16" BCM mid (0.076").
I don't claim to know much, but I read somewhere on here that there's more to it than simple port size. Barrel profile comes into play, as well as other things like port geometry and the taper of the bore. The short version was that (all else being equal) a pencil barrel will have more gas drive than a HBAR profile barrel with the same port size.
Originally Posted by
lysander
The only part of the barrel profile that makes a difference is the diameter of the journal.
A 0.625" journal will require a reduction in port size compared to the same barrel with a 0.750" journal.
Can you elaborate on this?
Also is this why a H2 buffer is recommended for the HBAR barrels? Does the profile at the journal affect the timing? If so how?
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