The "Standard Chassis Rifle" offering is what you are going to want for a chassis, or any rifle that does not attach to an actual AR10/AR15. The "AR10/15 Compatible" option has a slight cut out at the top of the grip to allow the safety selector switch to come down and into the grip area. The AR10/15 Compatible will still work on a chassis rifle without an issue, but the Standard Chassis Rifle version will have a nicer mate up at the top.
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