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Ypu could always try something like a railed pump and attach any pic rail laser/light to it. This pump has Mlok slots allowing you to run rails on it to mount any after market parts you want. https://www.opticsplanet.com/ergo-grips-mossberg-500-590-m-lok-rail-forend.html The rails here https://www.opticsplanet.com/odin-works-5-slot-accessory-rail.html An IMI grip for better ergos here. https://www.imidefense.com/product/fsg2-front-support-grip/ Then any laser/light combo as long as it mounts to apic rail Or just a laser https://www.amazon.com/rail-mount-laser/s?k=rail+mount+laser Or just a flash light https://www.olightstore.com/odin-black.html

John, the Crimson Trace Laser Saddle will fit the 20 gauge Shockwave. It comes with a shim that fits under the saddle to make it fit. I have one on my 20 gauge Shockwave. Proof here>>>> https://www.crimsontrace.com/products/laser-sights/ls-250g-lasersaddle-green-laser-sight-for-mossberg-12-20-gauge-shotguns/01-7820.html#start=1

Yes Edward you may have one, an have it mounted o a 20ga, and you may have provided data from the manufacturer saying it will work, but James after his 45 seconds of searching Google says that it won't work, so I guess that means you and crimson trace must both be incorrect.🤣😂🤣😂🤣😂🤣😂