In short, NO.
One goal for any combination is a consistent carrier velocity and cyclic rate.
If the reciprocating mass is constant, a similar cyclic rate requires the same total gas drive.
The combination of gas system length and barrel length dictates which portion of the overall pressure curve is used to cycle the system.
The gas port size then scales down this portion, resulting in the total gas drive.
In general, shorter gas systems require smaller gas ports to produce the same total gas drive.
In your example, a 14.5 MID with an .080" gas port has approximately the same gas drive as a 14.5 CAR with an .065" gas port.
These two configurations will behave a little bit differently due to the differences in timing, but the overall cycling will be similar.
Its interesting to note that either configuration can be optimally gassed, under gassed or over gassed, depending on the gas port size relative to what is optimal for each configuration.



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