Before I got the pliers as Bill is suggesting, I used the "wire" method.
Attach wires to each of the holes in the clip. Attach one of the wires to something stationary (loading press) on your workbench. The other wire can be attached to a large screwdriver (about the middle) Drive the blade of the screwdriver into your workbench and pry the clip open and twist the handguard out. It's actually not that hard, but it does take a little time to get it set up. The tool is much easier.
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