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Hey Mike, AR15Barrels has posted lots of great info on this topic, here is some of what he has posted over time...
"Reduced gas port erosion over the life of the barrel.
Since the port does not erode nearly as much, you don't need to "buffer up" over the life of the barrel like you should with regular barrels."
"If you look at how gas ports erode, you can see that it's NOT from the gas going around the corner from the breech, but from the muzzle.

My reasoning for this is that the gasses and burning powder that are pushing the bullet down bore are all moving in a forward motion.
When the gas port appears, the expansion of the gas that feeds the port has to change directions.
If the majority of the gasses feeding the port were really from the breech end, I would think that the wear would be on the trailing edge of the port, not the leading edge.
I believe that LMT is smart for drilling the port at an angle as that's the natural tendency of how the gas wants to flow.
That should dramatically reduce port erosion through the usable life of the barrel, reducing the need for heavier buffers as the port wears oversized like most carbines."
MRP gas port...
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Interesting and cool info...Thanks Trident! I had never seen that explained...and appreciate it!
-Mike
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My pleasure friend-0
Here are a few last quotes from AR15barrels regarding this topic that might be of some further interest or further help clarify...
"I can tell you this:
Every carbine barrel I have looked down with a borescope that had a shot-out throat also exhibited a lot of port erosion to the muzzle side of the gas port.
That tells me that the majority of the gas was flowing into the port from PAST the gas port, not before it.
That alone is my reasoning that a rearward slanted gas port is the superior design."
"They(MRP) drill the gas port at an angle which happens to co-incide with the direction that naturally occurs during erosion.
A normal gas port is drilled straight down into the bore.
When it erodes, the 90 degree corner is heavily notched off towards the front of the hole.
LMT simply drills the port at 45 degrees angle towards the front of the barrel.
When the gas flows back through the port, there is much less tendency for the port to erode because the port is already at the natural angle the gas wants to flow."
Thanks AR15barrels for the above sourced info
Last edited by ALCOAR; 09-17-11 at 13:19.
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Thanks for all the info.
Thanks Trident for the info, I have always liked Mike Rock barrels too. The most accurate rifle I have ever owned was a Rem 700 .308 with a Mike Rock M24 profile barrel. I sold it in 2004, I still regret selling that rifle.
The barrel blank I have right now that I want to use for my MRP is a Mike Rock SS 5R 1 in 8 twist. I was going to use the MRP SS 16" and have it cut back to 14.5", but it has the mid length gas. I would prefer carbine gas because I might be cutting it back to 12" if I end up moving to Oregon this winter, and I also would prefer the 1 in 8 twist too. That's why I wanted to know if I could just take the MRP parts and put them on a standard barrel. But I looked at the MRP barrel closer and it looks like where the barrel extension goes on is different then a standard AR15 barrel. I guess I will have to call Compass Lake and see if he will turn my blank just like the MRP barrel.
Thanks again for all the info.
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