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My M4A1 was supplied with an unported black cylinder which averages 300fps and swapping the cylinder for a ported blue cylinder increases the fps by an average of 26fps.
Similarly swapping a M110 spring between an unported black and a ported blue results in an average fps of 360 and 388 respectively.
I just use it as another method of fine tuning fps using combination of ported, unported and spacers to achieve the fps I require.
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