SBR barrel gas port help

[czgunner]

I've been reading and searching in an attempt to find a barrel for my SBR upper.
I want (pretty sure) a 12.5" barrel. I'm open to other lengths if it makes sense.
Trying to get information on a good port size is a bit maddening.
This will be shot suppressed, though through a .30 cal can.
My usual range ammo is Wolf Gold.
This is nothing more than a fun range gun, but I want a barrel that doesn't make me regret shooting it.
I don't want stainless.
Not a fan of the govt profile.
Of course hammer forged would be great.
Any info or help would be great. Thanks!

ETA: I realize that the 12.5" length isn't common, so I'm open to lengths above 10.5".