ERGO lets you get an all in one package, handguard barrel nut and rail covers all for the same price. The barrel nut is installed with a standard barrel nut wrench and once installed you have the rail covers to mount anyway you want to make your AR the way you want it.

Specifications and Features:
ERGO 4817-9-BK
Keymod Modular Free Float Rail System
9" Length
3 Pack of KeyMod Rail covers
One 18 Slot Ladder Cover
Aluminum Barrel Nut included
Full length, scalloped Mil-Spec 1913 Picatinny top rail
1.8" inside diameter to accept most suppressors
Uses standard barrel nut wrench
6061 T6 Construction
Type III Black Hard-Coat Anodized
CNC machined lightweight one piece free float design
Aluminum barrel nut allows mounting of up to 1" diameter barrels

Fits:
AR-15/M16 platforms