Hi All,
The topic of the overgassed AR has been much discussed. Many AR-15's do not have optimally sized gas ports, and are hard on brass and the gun. But, for the most part, even most overgassed AR-15's will still run OK.
Now, AR-10/LR-308's seem to suffer the worst from being overgassed. They already suffer generally decreased reliability compared to AR-15's, for many reasons. However, many seem to be WAYYY overgassed to the point of being unreliable. They also have a smaller latitude for function in terms of gas setting it seems.
Unfortunately, I have a custom built 308 AR with a Mega 18" barrel that seems to suffer VERY BADLY from this. With a fixed gas block, it would suffer from frequent malfunctions (2-3 out of 10) and rip rims off of cases. I have gradually modified it so that runs 100%, and the barrel has proven to provide good accuracy. This includes a A5 buffer tube/H3 buffer, AR-10 recoil spring, tweaked the extractor and extractor spring system, and installed a Kies adjustable gas block. I got tired of the tiny set screw on the Kies block and installed a Odin works adjustable block, with a detent system. This has been more reliable, except for the block sliding forward on the barrel and turning it into a single shot the first time I had it out.
Short of getting another barrel with a different gas port, does anyone have any better long-term solutions for this? The adjustable gas block works but is far from robust solution. All of my other AR's either have pinned blocks or clamp-on blocks like a VLTOR, and have been robust/trouble free.
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