Is there a sling swivel stud on the bottom of the foregrip (where the sling is currently attached). If so a Harris type bipod will mount to it. You can also have a gunsmith tap the foregrip for an extra stud if desired.
Not an exact replica in the vid but the concept is the same...
"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington