No. Because of the barrel nut size difference between the AR-10 and AR-15, the handguards and rail systems are not interchangeable.
Yes it does.
No, this comes with the a barrel nut, shims, and bolts.
Stern Defense does not publish the weight of the handguard. You would need to contact them directly for that information.
https://getstern.com/contact-us/
Stern Defense manufactures a specific wrench for their barrel nuts. We do not stock these wrenches at the moment.