Interesting, can you link? I've never seen or heard of issues with the newer SLR, SA, and Seekins blocks beyond the occasional "it got stuck" thing. Which I've never had because I put a drop of slip 2000 EWL every 1000-2000 rounds or so and go one click up and down. But I've also intentionally let the SA block go for 4K and it didn't get stuck, just a bit tight to move. Like I said, it is something you need to remember, but that is about it. I'd read positive reviews of the SA blocks on lightfighter as well. But if there are actual problems I'd certainly like to read about them.
MistWolf, that can depend on the design of the block. I'd suggest watching
this series of videos. But to give a quick summary: you cannot possibly have proper gas port sizing for every environment, load, buffer combination, rifle condition (dirty, clean, lube, etc), and suppressed/unsuppressed use, let alone combining these factors. This is especially true as the barrel gets shorter. That is why we see so many different barrels optimized for so many different loads, environmental conditions, and suppressed use. P&S had some good interviews detailing that makers like FN will even modify the port size if they know it is going for a competition in say Alaska vs. Arizona. What is optimal for M855A1 won't be for Tula, let alone can on/can off, and so on.
The adjustable gas blocks let you
optimize for just about every possible situation and combination, and do so on the fly. As long as the gas port is cut just a bit big you can have the same rifle eject both PMC Bronze and hot Israeli M193 both at 2:30 with a few clicks on the gas block. Same with going hot/cold, suppressor on/off, gun dirty/gun clean and so on and so on. There are other large benefits as well, like being able to use significantly lighter buffer+spring+BCG combinations to lower perceived recoil and muzzle movement (and extreme example being what the 3gun people do) not to mention the overall weight of the rifle. It also puts less strain on the BCG since it delays unlock (and all the other benefits of this). A side benefit of this that most people don't think about is that AGBs actually make suppressors far more pleasant to use, cutting noise down by
3-7db to the shooter's ear, and cutting down on blowback;
example here.
So there are a ton of advantages for very little drawback. Think of it like the switch from fixed stocks to adjustable stocks. And/or the switch from irons to optics. Same kind of process, and some kind of decision if it is worth it to the end user to KISS or go for the performance enhancement new technology offers.
Now I do want to be clear, yes plenty of rifles can work ok in a combination of conditions, but none will do so as well as or in as many as a rifle with an AGB that gets adjusted. Also, the gain is smaller (though still there) for those who will have the fewest variables change, so folks always using 1-2 types of similar pressure ammo with the rifle in similar conditions always suppressor or unsuppressed and so on (so basically most of .mil and most departments). Furthermore, an adjustable gas block isn't for everyone (or even most, can you imagine boots with 40 gas settings) but there is plenty of performance to pick up there if you are willing to.
Back on topic, the reason you get additional benefit combining the LMT E carrier and the AGB is that they compound the delay of unlocking and the AGB can help reduce the bolt speed (all else being equal). Hence my suggestion to OP.
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