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Jeff, it's the bayonet lug connection. You would need a Bayonet Lug Mounted Bipod Adapter. Example : -- https://www.google.com/search?q=bayonet+lug+bipod+adapter&sxsrf=ALeKk02DKTuJICl8JxBL29lG3FA2fRnDuQ:1584025152860&tbm=isch&source=iu&ictx=1&fir=Kuf9UsreZl56NM%253A%252C3Ktz-eK8jA3A4M%252C_&vet=1&usg=AI4_-kThpRQ8Q9KPSxaJgkCvCeo8UG1FeA&sa=X&ved=2ahUKEwjeqrTEmZXoAhV8lHIEHZ7UD-oQ9QEwBHoECAoQFg#imgrc=Kuf9UsreZl56NM:
Jeff, The bayonet lug is on the bottom of the sight. Bibod on bayonet lug will greatly hinder accuracy because it is connected to barrel/gas port. Better to put a rail section on bottom of forend and use rail mounted bipod.
Bayonet lug connection man.