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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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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€ 65.32

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Lock, Load, and Level Up Your Shotgun Game

DUAL GAUGE OPTIONS - Choose between 12 gauge (holds 6 shells) or 20 gauge (holds 7 shells) to match your shotgun and ammo needs.
VERSATILE OPTICS MOUNTING - Integrated Picatinny rail lets you attach scopes, red dots, or optics for tactical edge and quick target acquisition.
ROBUST ALUMINUM CONSTRUCTION - Durable yet lightweight aluminum ensures long-lasting performance without adding bulk to your setup.
QUICK TOOL FREE INSTALLATION - Mounts directly using factory holes with included set screws—no gunsmithing or modifications needed.
PRECISION FIT FOR MOSSBERG CLASSICS - Seamlessly designed for Mossberg 500, 590, and Shockwave series—no guesswork, just perfect compatibility.

The Monstrum Side Saddle Shell Holder with Picatinny Rail Mount is a precision-engineered aluminum accessory designed exclusively for Mossberg 500, 590, and Shockwave shotguns. It offers quick, no-gunsmith installation using factory mounting holes and features a Picatinny rail for versatile optics attachment. Available in 12 and 20 gauge sizes, it securely holds up to six or seven shells respectively, enhancing reload speed and tactical readiness.

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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