I installed these UTG rails on my Veterans today. They seem to fit perfectly and I now have full length rails under the forend. Can't get much longer at all really.
https://www.amazon.com/UTG-MNTP503-Tactical-Picatinny-Weaver/dp/B002GNYCNU
https://www.amazon.com/UTG-MNTP503-Tactical-Picatinny-Weaver/dp/B002GNYCNU