The New Daniel Defense MK18 barrels are ported at .072, and if you already have one of the overgassed barrels, Daniel Defense will replace the over gassed barrel with a .072 barrel.
The New Daniel Defense MK18 barrels are ported at .072, and if you already have one of the overgassed barrels, Daniel Defense will replace the over gassed barrel with a .072 barrel.
Last edited by JulyAZ; 07-18-17 at 14:34.
I have two generally unmodified DD Mk 18s purchased in 2015. Both have ~ 700 rounds of exclusively high quality mil-spec ammo run through them. They have been run suppressed with Surefire SOCOM Mini 5.56 suppressors. I'm assuming I have the standard oversized gas ports.
My experience has been no detectable gas blowback for these 1400 rds over the two Mk 18s. And that's firing hundreds of rounds at a time at carbine courses, where other people with different suppressed carbines (16" of all types) were sporting black powder mustaches on their faces / wiping their eyes throughout the day.
FWIW, this problem appears to be fully solvable by running a Surefire SOCOM 5.56 suppressor. These were engineered specifically for the Mk 18 platform to drastically reduce gas blowback, which is a major reason they won the govt contract to supply suppressors (to mil or LE or both - not sure) for the Mk 18.
Given the above, would there be any reason for me to consider swapping barrels for a smaller port size? I don't know what it would be. As an aside, I ran all these rounds using the standard factory spring and H buffer. I've since put H2's in both, as I was told it should cycle more reliably if I slowed it down, but I just went 1 step heavier, as it already worked perfectly with the H buffers running Federal XM855 and M193.
Last edited by Naphtali; 07-22-17 at 16:01.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
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