Performance Services LLC Kel Tec Sub 2000 Gen 2 Hand Guard Stabilizer (Old Style Barrel) Stabilize your Kel Tec Sub 2000 Generation 2 Hand Guard for solid optic mounting. Two stabilizers are recommended for longer, heavier optic mounts, or for extreme stability. Kel Tec makes 2 barrel styles, and this Stabilizer is for the Old Style Barrel. The bottom 2 pictures to left show the Old Style Barrel. See other listing for the New Style Stabilizer. Read product description below for important information.