These Black Rain Ordnance Mlok Handguards are anodized and not Cerakoted. But there is a Black Rain Ordnance Mlok Handguard model that are an FDE finish. The FDE model is model number BRO-MLOK-15-FDE.
The Aero Precision M5E1 Enhanced Upper is only compatible with the M5 Enhanced Handguard and will not work with this Black Rain Ordnance Mlok Handguard.
Yes. The Black Rain Ordnance Mlok Handguard will include the barrel nut.
Yes, it will.
The inner diameter of both the .223 and .308 handguards is 1.75".
Black Rain Ordnance uses DPMS low profile.