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Hi David and welcome. The handguard/Pump handle combo is best(no hardware needed): https://www.flashlightdealer.com/shotgun-forend-light-w--laser--mossberg-500-590-shockwave-details.aspx?srsltid=afmboorq16pc1map0r6y4ccfeya1qve5y7uijsbctyd1lj62osiui_e3&aspxautodetectcookiesupport=1
Hi David, the forend light/laser linked to below is for the 12 gauge model only. It will not fit the 20 gauge. If, by chance, you have the 12 gauge, the combo is here https://www.budsgunshop.com/product_info.php/products_id/149770/shotgun+forend+light+w+laser+for+mossberg+500+590+shockwave , There are none available for the 20 gauge, you would need to buy the light & laser separately. Laser option here >>> https://www.amazon.com/Monstrum-Picatinny-Mossberg-Shockwave-Shotguns/dp/B0CMFZZJVY?th=1 To mount a light, you would need something like this https://www.budsgunshop.com/product_info.php/products_id/711005435/magazine+tube+mount+12+gauge+for+tlr-1+tlr-2