I have a M&P15 sport II and looking to change handguard. I picked up a factory original 13” modular hand rail from Numrich (not the quad one) that comes on the M&P15T, see attachment. My question is what barrel nut does this handguard use? It didn’t come with one and I am not able to track down any information on which one is used. Is it the one in other attachment? Thanks for the help.