Monkey Posted September 4, 2010 Share Posted September 4, 2010 I have a line on a used M4 barrel, but I want to make sure it is the current 2-port model and not one of the older 4-port models. Is there any way to determine this without looking into the barrel itself? The barrel is a fixed choke model, not screw-in. Thanks. Quote Link to comment Share on other sites More sharing options...
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