Swiss Arms Riser Rail Originally designed for the AR15 type Airsoft guns;This mounts on-top of the receiver rail and provides a 25mm;(1 in.) higher rail for lifting any aiming devices;Fits any 21mm Rail Making it more comfortable for shooters wearing full face masks.;It is perfectly centered on the top rail and features a see-through tunnel, allowing the use of back up fixed sights

• Swiss Arms Riser Rail for Weaver & Stanag

Swiss Arms Riser Rail for Weaver & StanagSwiss Arms