I use the DPMS white block, the receiver sits down on it and its held in the at the takedown pins holes. I've had to relieve some of the Delrin from the front edge of the block to allow it to fit with Lite Rails because of the flange. I use the bottom of the block to face the handle side of the vise and a piece of wood or a padded vise block on the opposite end against the top of the receiver.
For a Lite Rail install you'll need a DD Lite Rail barrel wrench as well.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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