Need some help locating the thread that had the different brands gas port sizes listed. Running out of ideas to put in the search box to narrow the field down. 
Thanks
found the thread I was looking for.
After reading that thread, great info by the way, Iām a little confused.
Are the gas ports drilled by the barrel maker or the weapons company, LMT, BCM etc.? I would think that thatās the barrel makers responsibility. I was curious about the SDI barrel Iām using for my project and happy to see that it measures out to .063. Would a lower tier manufactorer contract barrels from a maker w/ larger or less consistent gas ports at a lower price?
Gas ports should be consistent for size. A sloppy manufacturer may push the drill too long, and have some oversize ports within a given lot of barrels.
Gas port sizes are all over the map. Each manufacturer seems to have his own idea of the ācorrectā size. .063 is the smallest carbine size Iāve heard about. I believe LMT runs theirs .071? Correct me if Iām wrong.
Rifles can run .093 to .099. Slightly overgassing will cut down on operation issues. I donāt think this is a reflection of poor workmanship or quality.
Mark15
LMT runs .071" on 10.5" guns, their 16" guns are typically .063" unless you have a lot of rounds through them and have eroded open.
I emailed Bravo co. to ask about their 11.5 in. barrels and I was told that they are .076.
Typically, your lower tier AR manufacturers are going to use gas ports in the .078-.085. Range. Why? because they do not want to get calls to their CS Dept. complaining about their bolts not locking back.
What the consumer fails to realize is that the extra pressure and heat causes faster wear on the weapon and greater recoil felt by the shooter.
The other thing to remember about gas ports is that they erode. So when you start out with a weapon with a large gas port to begin with, it is only going to get worse.
C4
seeing as though the OP found his answers, iām hijacking this thread a bit.
Grant, in your 11.5 in Bad-Assed upper thread, you implied that youāre running a smaller than normal gas port size. could this fine tuning be done by an āadjustableā gas block? if so, any suggestions on a high quality one?
Yes, you could do that. PRI and JP both makes some and have messed with both. I find neither of them acceptable for serious use.
If you want a gun to have multiple gas port sizes, get a Noveske SB.
C4
i thought the SB was on/off?
No. Off, Regular and Suppressed.
C4
sorry, thatās what i meant. would the āsuppressedā setting work well without a can? my state doesnāt allow for them
It might work, but will not lock back and you will have to use mil-spec pressured ammo.
C4
i got a noveske 13.7 middy with a KX3. do you sell the SB separately?
O do not believe that the sell them alone and even if you could get one, you would have to pin it on.
C4