The Wilson Combat TRMLOK10 AR-15 M-Lok Handguard is the 10.4" AR15 handguard. The handguard at the link below is the AR10 12" Wilson Combat Handguard, if you are looking for an AR10 model.
https://www.opticsplanet.com/wilson-combat-trmlokar2012-ar-10-m-lok-handguard-6005a-t5-aluminum-black-hard-co.html
The Wilson Combat AR-15 M-Lok Handguard is 10.4" in length and has an internal diameter of 1.350", making it compatible with most low profile gas blocks. It weighs 9.6 ounces (with included barrel nut and hardware).
Yes. The Wilson Combat AR-15 M-Lok Handguard will include the barrel nut as well as mounting hardware required to install the handguard.
The inside diameter of this handguard is 1.35"
This is 10.4"