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Message: <blockquote data-quote="NikatKimber" data-source="post: 2988144" data-attributes="member: 423">Which is why I linked the article, since it does provide back to back comparisons against other comps.Comps work based on gas flow through the ports. So in theory they would be more effective (% reduction wise) on shorter barrels with more gasses flowing out the barrel with which to work. Also, larger comps would have more area to add more reduction with more gas flow. So a particularly efficient for the application comp ("X") that works great (places 1st) on a 20" 5.56 may not do as well in a larger caliber on a shorter barrel. Basically, YMMV. But still, a back to back test like that does show some designs are more/less efficient than others.</blockquote>