The ID measurement doesn't include the channel for the gas tube at the top.
Yeah, that. The Sentry 7 set-screw should pretty much fit any handguard. The clamp on sticks out a bit more and doesn't work well for long BCM KMRs which can deflect.
Aye aye ayyyyyyee....I wanted to wait an get least 500 rounds down the pipe before I started another .308 build. You're killin me man, killin me! lol
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I started a build just based on the centurion, fitting it's the last part I need. I have a fortis switch in mlok that may go up for sale. Got it thinking the cmr was unavailable