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Phillip, if you are talking about the LS-250 model, https://www.budsgunshop.com/product_info.php/products_id/107805/crimson+trace+ls250+lasersaddle+red+laser+mossberg+shockwave+500+509+receiver+mounted+black+polymer , This will not fit the 590M receiver. Per Crimson Trace - Fits Mossberg Shockwave, 500 & 590 receivers. Does NOT fit the 590M receivers. Stay safe & have a great day!

Phillip, unfortunately no it won't fit the 590M shockwave. Not really finding any laser options that will either. Did find the nightstick SFL-11GL it replaces the pump forend but reading reviews some say it fits, some say it doesn't. Hopefully manufacturers will start making more options soon. Sorry but hope this helps some.

Hi Phillip and welcome to the Buds Community. Unfortunately it will not fit the Mossy 590M receiver. Monstrum has an alternate solution : https://monstrumtactical.com/mossberg-red-laser-sight-system-with-picatinny-mount/