There are no set standards for AR10s and Savage didn't bother to follow the ones that most play by. They use a Mid+ gas system, but it should not matter. As long as your gas system parts match up you are fine. In fact, a longer gas system is better for .308 anyway. Don't worry about the smaller port either. Most .308 ARs are over gassed as it is. I think the MSR has an adjustable gas block so you are just blocking the larger port off.
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