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Old May 20, 2012, 09:16 PM   #10
rsilvers
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Join Date: January 16, 2011
Posts: 66
I am not convinced any subsonic 223 cycles an M4 between the 700 and 950 rpm that Colt lists as the specs. The rounds may "cycle" - enough to make a video for youtube, but if they are below 700 rpm they will not be all that reliable when cold and/or dirty. This applies to semi-autos as well.
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