That's probably along the right lines.
Thinking about the standard non spring setup, even during level shooting this applies.
After the carrier has slammed shut and the weights have done their thing and bounced around, the position of the weights will be somewhat random.
Also rough handling and running could move the weights around.
When the next shot is fired, this random weight distribution could lead to inconsistencies in the BCG velocity during initial unlocking, which would translate into less reliability.
*******
I did some quick and dirty bounce tests yesterday.
Hold the upper, pointed muzzle down.
Retract the carrier up to it's full stroke and let go.
A bare carrier bounces up about a 1/4" and sticks.
Then set/double tape the different buffers on top of the carrier in their normal relationship.
The CAR still allows bounce, but probably only an 1/8" and sticks.
Both the H2 and A5 completely eliminate bounce as the final carrier pisition is fully closed.
This test is not entirely accurate, as the impact speeds are different, but it provides some insight.



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