This Pantheon Arms designed KeyMod handguard for the AR15 provides tremendous value for your money. It is 6.5 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). When mounted on a Dolos lock collar, the handguard will extend 7 inches from the face of your upper receiver. 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.