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
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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.
http://m4carbine.net/showthread.php?...highlight=port
After reading that thread, great info by the way, I'm a little confused.
Are the gas ports drilled by the barrel maker or the weapons company, LMT, BCM etc.? I would think that that's the barrel makers responsibility. I was curious about the SDI barrel I'm 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 "correct" size. .063 is the smallest carbine size I've heard about. I believe LMT runs theirs .071? Correct me if I'm wrong.
Rifles can run .093 to .099. Slightly overgassing will cut down on operation issues. I don't think this is a reflection of poor workmanship or quality.
Mark15
I emailed Bravo co. to ask about their 11.5 in. barrels and I was told that they are .076.
Owner/Instructor at Semper Paratus Arms
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
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
Last edited by C4IGrant; 07-03-09 at 15:56.
seeing as though the OP found his answers, i'm hijacking this thread a bit.
Grant, in your 11.5 in Bad-Assed upper thread, you implied that you're running a smaller than normal gas port size. could this fine tuning be done by an "adjustable" gas block? if so, any suggestions on a high quality one?
"you give peace a chance, I'll stay here and cover you, in case it doesn't work out"
i thought the SB was on/off?
"you give peace a chance, I'll stay here and cover you, in case it doesn't work out"
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