We've received emails before from our readers asking where to get a Flat Top Rail for thei TAR-21 airsoft guns and now we can give them a definite answer. WGC Shop announce that they have the UFC Metal Flat Top Rail System for TAR-21 AEGs. With an all black anodized finish, this is a one piece consecutive full length top rail conversion kit so you can attach weapons accessories on top of the TAR-21.