Will this mount to the mossberg maverick 88 12g?

You can drill and tap it yourself. It will fit if you are willing and able to do this correctly. It is a bit of a pain, but it is a great way to save $250 over moving up to a 500 or 590 just for the holes. You can buy a drill press, still have money left over, and get an optic mounted on your shotty. The 88 is fantastic for the money, except for the lack for 4 holes atop the receiver. :(

I have a crimson trace on my Mossberg 590, will this be too much to fit on there?

I ordered this for use with my Shockwave with crimson trace. The crimson trace changes the profile of the receiver and the mount did not sit flush when installed. I opted for the GG&G side saddle designed for the shock wave. More expensive but better quality. When installed the top rail and side saddle was canted to the right and also it sat way too high above bore.

Is this good for 590 shockwave 20 gauge?

I have a 590 shockwave 12 gauge and fit and works great

Will this fit a mossberg 940?

It has predrilled holes that makes it compatible with almost all shotguns, so yes.

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Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns

Product ID: 161561204

Details

Brand
Monstrum
Closure Type
Open Top
Color
Tan
Manufacturer
Monstrum
Material
Aluminum

🎯Picatinny/Weaver rail compatible

🔫Fits Mossberg 500/590/Shockwave

⚙️Aluminum build, no gunsmithing

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B/.127

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔫 Elevate your Mossberg game with tactical shell storage and optics-ready rail!

DUAL GAUGE OPTIONS - Choose between 12 or 20 gauge shells—carry up to 6 or 7 rounds respectively.
VERSATILE OPTICS READY - Integrated Picatinny rail supports scopes, red dots, and more for tactical edge.
ROBUST ALUMINUM CONSTRUCTION - Durable, lightweight design built to withstand rugged use without adding bulk.
QUICK TOOL FREE INSTALLATION - Mounts via factory holes with included set screws—skip the gunsmith hassle.
PRECISION FIT FOR MOSSBERG CLASSICS - Seamlessly mounts on 500, 590, and Shockwave models—no modifications needed.

The Monstrum Side Saddle Shell Holder is a precision-engineered aluminum accessory designed exclusively for Mossberg 500, 590, and Shockwave shotguns. It securely holds 6 to 7 shells depending on gauge size and features an integrated Picatinny rail for mounting optics. Installation is straightforward using factory mounting points and included hardware, requiring no gunsmithing. This rugged, lightweight holder enhances reload speed and tactical versatility for serious shooters.

Specifications

ASIN	B07WHN74TW
Best Sellers Rank	#67,729 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #36 in Hunting & Shooting Gun Holders
Brand Name	Monstrum
Closure Type	Open Top
Color	Tan
Customer Reviews	4.6 4.6 out of 5 stars (3,921)
Manufacturer	Monstrum
Manufacturer Part Number	Z83
Material Type	Aluminum
Number of Compartments	1
UPC	850004377246

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