The barrel lug is very important. In addition to it's being necessary for headspace, it is responsible for the action being located properly in the stock. It's a big reason why Remington bolt action centerfires have been so accurate over the years.
When glassbedding stocks it's very important to use a couple of layers of masking tape or some modeling clay to keep the bedding material away from the bottom, sides and front of the recoil lug. The rear of the lug is the only part that should be bedded tightly.
Other actions, like Mausers have integral lugs, but not as long as the Remington. Many rimfires don't have lugs, so I glassbed the rear of the action to act like a lug.
Picher
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