No, you will need to use the GG&G Mossberg 590 Shockwave Flashlight Mount, which can be found by using the link below:
https://www.opticsplanet.com/gg-g-mossberg-590-shockwave-flashlight-mount.html
The GG&G Mossberg 500 Sling & Flashlight Mount Combo will work with a Mossberg 500A.
This GG&G Mossberg 500 Sling & Flashlight Mount Combo will not fit the Mossberg 590A1. You will need the model at the link below.
https://www.opticsplanet.com/gg-g-mossberg-590-sling-and-flashlight-combo-mount-12ga.html
The GG&G Mossberg 500 Sling & Flashlight Mount Combo will not work for a Mossberg 590M.
Yes, this should fit with ease.
The mounting ring for the light is separate. See https://www.opticsplanet.com/gg-g-1in-flashlight-mounting-ring.html.
No, this will not work the 590 end cap. Contact us at techsales@opticsplanet.com so we may further assist you.
Please email us at techsales@opticsplanet.com for further assistance.
Yes, this is ambidextrous. The pictinny rail will point forward when configured for lefties.
Unfortunately, GG&G makes this product for the 12-gauge only, it is not compatible with the 20-gauge Mossberg 500.
Mark H.