Choose Options Quick view TDI Arms 6" Picatinny Rail for M4/AR15 TDI Arms Now: $19.95 Was: Attach a 5 5/8" Picatinny rail to your existing handguard with this single rail attachment. Easily coverts your handguard into a handguard with a Picatinny rail for grips, lights, lasers and more... Now: $19.95 Was: Choose Options Quick view Qty in Cart: 0 Price: Now: $19.95 Was: Subtotal: Choose Options