Anytime you're running the suppressor, make sure that the carrier is lubed up well. These beast's like the carrier's pretty "wet" without the suppressors. I usually run a good light film of high temperature bearing grease on mine (plus a little on the lugs.....not too much though) when I'm planning to run suppressed. Different guys have different views on the grease on the lugs. I'm only speaking on what works well on mine (Armalite's). As with the gas.....even using hot loads, I find it always good to start it out tuned down low, and slowly work it up until the bolt holds open on the last round. I run adjustable blocks on just about all of mine and don't seem to have any issues. Now, with all of this said, I haven't tried using the LMOS carriers yet so I can't really have an honest opinion about them. I do know that others on the board use/or have used them, and are much more qualified to comment on them. In short, trial and error is always a good solid form of testing to see how your rifle likes to run. Ron