The Auto-5 Light 20 has a 26" or 28" vent rib barrel, blued finish and a checkered walnut pistol grip stock and forend. It is similar to the original FN light 20. It is approximately 10 ounces lighter than the Standard weight gun. The Blue Book values are:
Add 20% to 30% to the Blue Book values for retail prices.
A gun in very good condition is valued at $625 trade in and $820 retail.
I hope this helps you,