I remember 87GN stating a few things about the gas port dimensions. Maybe he can weigh in on the matter here. I won't be able to find the threads on TOS.
And based on my limited experience with my buddy's LMT and my DD with nearly identical configurations. His cycles much softer and smoother. I'd still buy a DD barrel if I had to do it all over again. It handles and groups nicely. And I never had a malfunction out of it running it hard. So it is a very reliable upper.
As far as the dimension for a Mk18, I know that they are different. Larger right? This is why I ask... I really want to buy a reliable upper that can run both suppressed and unsuppressed. I you or anyone else can school me on Mk18 gas port sizes, I'd be much obliged.



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