Why do you think it's the carrier? Do you have an adjustable gas block? I have a JP with the LMOS and other large platform ARs and - depending on the set up (gas system length, adj GB, barrel length, spring tension, loads you're shooting, and more) - there could be a way to remedy the issue without having to go through replacing a carrier only to find that you have the same problem. Can you provide some more detail with respect to your rig's configuration? That would help shed a lot of light on what the best route would be to make your rifle a smoother shooter.