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The KA clip won't fit...different shape. The G&P ones are "standard" shape.
The brass ring helps to center and stabilize the inner barrel within the hopup. Not only should the ring be a tight fit on the inner barrel...but it should be a squeeker to get into the hopup unit.
An AEG will work without one...and I haven't been able to detect any significant FPS loss/gain by not having one. Can't say for certain re. accuracy gain/loss...most of mine end up being carbine/CQB rifles.
But if you've got one...they're worth putting in there.
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