Re: smallest handguard.?
Bear in mind if you decide to use a pistol length handguard on a rifle barrel with a carbine, midlength, or rifle gas port position you will have a healthy amount of exposed gas tube running down your barrel, not to mention less surface area to hold onto when shooting...furthermore a lot of these aluminum ff tubes help dissipate the heat from the barrel nut by transferring it to the rail system...more rail means a bigger heat sink.