Are you using an Adj gas block?

[Klem]

The best way to approach adjustable gas is away from the port, like Savage did with the MSR-10 using a cylinder in the block, as opposed to a set screw over the port.

The problem with choking the port and increased erosion is that you end up chasing your port erosion with more choke, especially on softer steels like many stainless barrels are made from.

Since Grendel has such low working pressure from the start, I doubt you'll see rapid erosion on RLGS, but on MLGS and CLGS, it will happen faster, especially if the port is too large from the start.

Another problem with adjustable gas is carbon-welding, which has been really problematic for me using the set screw designs.

It would be interesting to do a length borescope analysis series of checks over a long round count, looking at port erosion between 2 different barrels of the same make, one choked, the other not.

With respect, until there is some hard evidence that either accuracy or barrel life suffers to a greater extent when using adjustable gas blocks then I don't think you can make such a claim. Certainly not with such matter-of-fact authority. Linking port erosion to adjustable gas blocks and then advising that non-adjustable is better than adjustable blocks is a non-sequitur.

I am with Keystone on this one. I have used SLR adjustable blocks in 5.56 and 6.5 uppers. They have all performed flawlessly. I agree however that the newer clamping-style blocks are an inherently better design than the older set screws.

Adjustable gas blocks are not essential for a suppressed AR, but they do help tame the increase in port pressure. This is evidenced by the brass ejection pattern.