The extra cam track length buys you more time for chamber pressure to drop.
This time can also be had by going to a longer, rifle length gas for example.
If you compare the extra time delay by each, and they are similar, you could conclude they both extract under similar chamber pressures.
Not "hard evidence", but something to think on.
On a related note, all the other systems have gobs of cam travel, on the order of .75". These are also usually in conjunction with fast acting, high impulse piston systems, so the cam track is the only way to achieve the delay.
On the DI system, I believe there is a gas delay effect that partially makes up the opening delay, with the small cam track delay making up the rest. This works best on rifle length gas systems.
Going to shorter gas systems eats into the delay provided by the gas system.
I think a carbine gas would be fine IF the cam track could be lengthened to compensate.



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