J P Enterprises DIRECT THREAD MODULAR RAIL PICATINNY ALUMINUM BLACK 4'' JPTR-L

 Rail Kits designed for JP system, will also work with many other free-float tubes. Modular handguard/rail system gives the tactical shooter maximum flexibility to customize the number, position, and length of accessory rails on his rifle. Mount rails or sling swivels at 45° intervals around the handguard.