I have a Springfield Saint and I am changing the handguard and barrel nut to a free float handguard. So here's the problem.... my buddy gave me a free handguard with no barrel nut or anything. Keep in mind I already have a low pro gas block. But I can't find who makes this handguard anywhere so therefore no barrel nut he's a couple pictures of everything. My question is I need to know exactly what I need to get this thing installed. Thanks guys.