These adapters are for the RAW HM 1000x shrouds that are 2inches in diameter. Not compatible with the offset ones.
There are two types of shrouds out there, remove the factory short screw on suppressor.
If your shroud looks like the one in the picture below, select A65. NOTE: This adapter has M18x1 threads, so you may also need an M18x1 endcap for your moderator.
If it looks like the shroud below then select A90. This adapter does not have a thread protector.