This Pantheon Arms designed Keymod handguard for the AR15 provides tremendous value for your money. It is 14.5 inches long, Keymod on 7 sides, with a full length picatinny rail was designed especially for the Dolos takedown system, but works great with a standard barrel nut (sold separately). The inner diameter is 1.750".
The differentiator between our handguard and those made by others is that we combine the strength of lockup provided by a threaded barrel nut with the clamping power of a compression lock. There are no jamb nuts or set screws to loosen, even under the extreme torque applied to the handguard when attaching your barrel to your rifle.