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yes it will fit the 590S Shockwave see ******Nightstick Shotgun Forend Light/Laser Specifications and Features:
Nightstick Item Number: SFL-11GL
Shotgun Mounted Flashlight
Integrated Green Laser
LED Bulb
High Lumens: 1,200
High Beam Distance: 203m
High Candela: 10,315
Runtime (High Power): 1.5 hrs
Momentary and Constant-on Modes
Ambidextrous Switches
Powered by (2) CR123 Batteries
Glass-Filled Nylon Polymer Construction
Drop Rating: 2 meters
IP-X7 Waterproof
7.1" Length
2" Width
1.3" Head Diameter
Weight: 17.5 oz
Black Finish
Fits:
****** Mossberg 500, 590, 590A1, 590S Shockwave

Hi Carol and welcome. Yes it fits the 590S as well. Key design changes of the 590S include a redesigned elevator and bolt slide combined with the addition of an energy-absorbing bumper. The dual action pump guide bars remain the same fit as the 590 family. Cheers and stay safe!

Yes, fits & functions properly with all Mossberg 500, 590, 590A1, 590S Shockwave models.