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Hi Roger, no sir, this only fits the 12 gauge. Stay safe & have a great day!

Hi Roger and welcome. No Sir, you could use this for the 20ga : https://www.gggaz.com/mossberg-20ga-shockwave-flashlight-mount.html ------- Cheers and stay safe!

Unfortunately, thus is Only for 12 gauge models. The action slide will not accept this on a 20G model.

sorry 12 ga only as mag tube is to small on the 20 ga see**** The SFL-11GL shotgun forend weapon light with green laser is a complete forend replacement for your *****12 gauge Mossberg® 500/590/590A1 or Shockwave pump-action shotgun.