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They are molded as part of the stock. They are sturdy enough to put a sling on and carry it around. Don't expect to be doing pull ups or some other stupid stunt with them
I never use a sling OR bipod on my 795, but I'm about 90% sure it has metal sling swivel studs. I can check/confirm tonight if nobody does sooner...? The Marlin XT bolt actions I've seen with synthetic stocks DO have attachment points molded in.