Uh, where is the hole? One of the forestock holes, near the metal ferrule, is to assist in the gas escaping when the piston blows back to set everything in motion. I would not place anything in that hole. You need to add another hole and then mount a sling swivel stud with backing plate in the hole. Make sure the backing plate does not interfere with the operating rod and that it is curved to match the stock. Inletting it would be better but requires some small gun smith skills. This will allow you to mount a Harris bipod or any bipod that will mount on a sling swivel stud.
Just something to think about.
__________________
Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard.
Experience is what you get right after you need it.
Author unknown.