18" Barrel Rifle Length Gas System (RLGS) vs MLGS

[98Z]

Did a little Googling and one reviewer says it's 0.092-0.093, which is about the same as a 20" RLGS. So, I'd venture that it's slightly undergassed.

I've got the Ballastic Advantage Mk12 profile barrel - 6.5 Grendel Mk 12 SPR profile, heavy stainless, rifle gas, measured out a 0.100" gas port diameter.
Only shot Hornady Black through it, and my handloads. Never a hiccup, not once. It does shoot quite smooth.

Also have this one, but the build isn't finished yet, and the barrel is unfired. Faxon midlength data: Faxon Firearms 6.5 Grendel gas port info: Match Series- 18" Gunner, 6.5 Grendel, midlength gas system, 416-R, 5R, Nitride, Nickel Teflon Extension - Gas Port diameter = 0.077".