Geissele mk13 9.5" - Geissele MLOK MK13 9.5 Inch Super Modular Rail

Great handguard. Locks up more solidly than most of my others, though it's on the heavier side. Barrel nut wrench provided is more than adequate. I'm a big fan of the barrel nut/handguard interface - it's longer than most and very sturdy. I'm still on the fence about the setscrews to lock rotation, but I guess this is useful for non-standard uppers. The picatinny rail sections out front allow you to mount accessories where the gas block may prevent attachment of m-lock rail sections.