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Your cart is empty.The CDM Gear LLC MTRS and MTRS20 gun light mounts are specially designed to mount rail mounted lights and lasers on Mossberg 590 12 and 20 gauge Shockwave guns accordignly. These lightweight clamps fit in the narrow space in front of the fore end stock and clamps to the magazine tube. The mounts do not have to be removed when removing the barrel! The MTRS and MTRS20 mounts can be positioned 2 ways, left or right, and provides a solid "lock up" around the magazine. Each position allows for a sling to be used with the included under mount sling slot. Additionally there is now a side sling slot that will work on the left or right side. Manufactured from aircraft grade aluminum and hard coat anodized it is a superior mounting solution for those with limited space mounting requirements. One tool for one bolt is all that is needed to attach and remove the clamp.
John Hawkey
Reviewed in the United States on June 8, 2025
Why the one cutaway slope in the middle of the rail? I had to get an adapter to keep my shotgun laser-light mounted or else the little fixing notch would fly right out. Besides that gripe its perfect and adds so many attachment options to a home defense piece.
Roberto
Reviewed in the United States on May 23, 2025
Great for holding what you mount
j Fritz
Reviewed in the United States on October 11, 2024
Fits very well and holds my light very nicely.
THORNE
Reviewed in the United States on June 3, 2023
Was looking at a racker-light combo from streamlight. Luckily I saw this and had a TLR1-HL available. Fit is perfect. Similarly positioned as on a couple of ARs and an old Marlin 22 i have.
Customer
Reviewed in the United States on May 6, 2023
Seems like a solid product. You can tell that whoever designed this knew what people wanted for an accessory mount.My only gripes are the finish color and the very small interference between the forearm slide and the rail that came with the light I chose. I'm guessing others could have the same problem even if they fit a different light... since the fit/size of a rail will be close no matter what.The finish color or shade does not match the 590S Shockwave barrel, magazine tube, forearm slide or magazine cap. I think that's something that should be considered in any future design revisions. Easy improvement to the aesthetic.The forearm slide interference (again, from a light/rail add-on that i chose to go with) does not prevent the cycling of shells at all, but it does leave a very very small dent. I'm not particularly worried about it, but that could bother some people.As you can see in the pictures I include with this review, I went with a TLR-1 HL from Streamlight.
John
Reviewed in the United States on May 20, 2023
I like the ease of installation and it fits perfect. I recommend a 45° offset rail mount to provide clearance on the pump handle action. Choice of mount angle and light will affect the fit with shorter barrels.
Rico
Reviewed in the United States on April 12, 2022
When looking for a weapon light mount for the Mossberg 12 gauge Shockwave, buy this one. The GG&G mount sticks way too far out to the side, and is flimsy to boot. This one is thick aluminum, and the attention to detail is impressive. Has a pin to center the rail, and grooves to keep it from sliding. Common sense dictates a drop or two of thread locker on the screws. The sling loops are very robust.
Robert B.
Reviewed in the United States on May 31, 2021
The maker of this product, CDM Gear, is now aware of this issue, and intends to amend the item description. This mount, despite how VERY well made it is, will NOT fit the 12g 590 Shockwave variant with Walnut furniture, the “590 Nightstick.” The gap in front of the Nightstick’s pump handle, where it is intended to be installed, by design, is apparently too narrow on the 590 Nightstick.Such a shame, as it appears to be an OUTSTANDING mount for the “polymer furniture” version of the Shockwave. I still gave it 5 stars, despite it not working for me… that’s how nice it is. And CDM/ Amazon was nice about it, and allowed the return.
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