I would think Melvin would do warranty work or consultation on a NULA.
Quote from his web site.
Melvin Forbes will continue to provide service for all Colt Light Rifles and Forbes’ Rifles. The Colt Light Rifle was sold with a conventional synthetic stock and many owners send them in to be restocked with the same stock used on NULA rifles. Additional services include re-barreling, trigger replacement, general cleaning and preventive maintenance and care. Contact Melvin Forbes at (304) 292-0600