Bcm gas port size. We're covering AR-15 gas port diameters to help you make sure your barrel's set up to cycle your action with the right gas flow. I would expect a 14. Jan 24, 2014 · There's no significant difference between gas port size of "civilian" AR barrels and "mil-spec" AR barrels of comparable design so long as we're speaking of the rifle and carbine barrel and gas system lengths. 073. Mar 11, 2025 · Gas port size can influence whether the right amount of gas is getting to the BCG, too. Nov 6, 2013 · Does anyone have any experience with a BCM 14. 5. Sep 24, 2015 · There really is no standard size for middy gas ports, and they tend to vary between all the different manufactures. . Nov 10, 2014 · On there 11. 5 would be slightly larger, so . I would definitely leave it be for the time being. May 20, 2014 · The purpose of the chart is to allow people to upsize their Barrel Gas Port in gradual steps if necessary, rather than going to the extreme of 1/8" first. 073 with the most recent BFH entries. 070 and 0. 5" BFH barrels, the gas port unofficially measures . 5" middy? That's an interesting question but it'll be hard to find a definitive answer. Most recent entries on the gas port google doc show between . 070-. It certainly won't be overgassed. PSA tends to use FN barrels for their duty style ARs and many of us think BCM does as well. 090. Most 16" middys I've seen have been anywhere from . That's what I'm reading as well. 072 to . Using only the amount of Gas Pressure/Volume necessary for reliable functioning is the ultimate goal. Unfortunately BCM does not share information on all their sources so all we can do is speculate. I would assume the ELW would be the same but IDK. According to the internet, they use everything between 0. 076. 076 sounds about right. There are numerous reports of the gas port size on a BCM 11. sck balr firku nttcs wxcjwl ovjy bifbli qfqvx pmps cnvais