Test the rifle with your preferred H2 buffer, and if it is between 700 and 950 rpm, then it is within Colt M4 specs, and not over-gassed - and does not need fixing.
Printable View
I am only objecting to the common interweb style of science of determining that something is wrong without testing it. Colt rejects M4s which cycle above 950 rpm. That is a good standard to use in determining if a rifle is over-gassed. The gas port size on its own cannot be used because the rate of fire is effected by things such as ammunition, hammer springs, gas leakage, and cam paths.
That may be true. However, it is also not the full story. In order for the RPM measurement to have any meaning, it must be measured while using ther correct, acceptable parts. What buffer does Colt find acceptable? Does Colt use a carbine buffer? Does Colt find an H and/or H2 buffer acceptable? I'm asking because I do not know.
In my opinion, I'd rather the rifle worked properly with a carbine buffer as that means there is less mass banging back & forth inside the upper which reduces how much it disturbs the rifle during operation
Too much overthinking for me. I checked the port(s) simply because I needed to remove the FSB for rail installs and mods. FWIW- they were standard DPMS carriers and I have used them with other builds and they were fine. I just don't use their mediocre bolts and barrels.