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Sorry to necro, but does anyone know what the BCM socom barrels measure at? I’ve been considering them lately as I can’t find Colts Socoms in stock from the retailers that I trust.
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Brownell's has them in stock
https://www.brownells.com/rifle-part...prod71337.aspx
Last edited by MistWolf; 10-11-18 at 05:13.
The number of folks on my Full Of Shit list grows everyday
I am American
Is there any data on the Colt CCU mid-length gas port size?
I would like to know as well
CCU mid has been reported as .071”
The requirement was that the XM4 works with primarily M855 ammunition but it should not have excessive problems with M193. So much testing was done to ensure that whatever port size was chosen would work with both pressure curves.
Test were performed with 0.062"(or 0.0625"), 0.0635", 0.0645", 0.0655" and 0.0665" gas ports. In order to get reliability results that did not include individual weapons quirks, the gas ports were tested, then reamed to the next larger size and tested again, and they state that the steps were 0.001". The report is a bit confusing as sometimes they state the staring point for reaming the port is 0.062" and other places 0.0625". Then they conclude by stating that a 0.0625" should adequately power the XM4. I believe that that originally it was a standard 1/16 inch diameter drill that was the starting point.
Then the drawing comes out and it states the gas port should be 0.062 +.001/-0".
So, gas ports on new SOCOM barrels should be 0.062" to 0.063" diameter.
Last edited by lysander; 08-09-21 at 13:57.
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