With the rising popularity of piston operated ARs, Otis has developed the Otis Rail Riser to work in conjunction with the Otis TRS free-floating rail. Unlike standard hand guards, the TRS/riser combo gives you a rock-solid mount and broader ability to customize your weapon with a laser, scope, illuminator or other accessories. Patent pending.

- Compatible with most piston operated systems
- Rail nut with offset inner hole provides clearance for proper operating rod/rail fit
- Additional barrel nut and wrench for anchoring of barrel against upper receiver
- Alignment pin for accurate rail nut piston hole and upper receiver gas tube hole alignment