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

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
Black
Manufacturer
Monstrum
Material
Aluminum

🎯Picatinny rail for optics

🔫Fits Mossberg 500/590/Shockwave

🛠️No gunsmithing needed install

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Description

🔫 Gear up like a pro—never miss a shot with Monstrum’s side saddle shell holder!

ROBUST ALUMINUM BUILD - Durable, lightweight aluminum construction ensures long-lasting performance under pressure.
TOOL FREE INSTALLATION - Install quickly with included set screws—no gunsmithing or modifications required.
GENEROUS SHELL CAPACITY - Choose between 6-shell 12 gauge or 7-shell 20 gauge holders to keep you battle-ready.
INTEGRATED PICATINNY RAIL MOUNT - Mount scopes, red dots, or optics effortlessly to elevate your tactical edge.
PRECISION FIT FOR MOSSBERG SERIES - Seamlessly designed for 500, 590, and Shockwave models—no guesswork, just perfect compatibility.

The Monstrum Side Saddle Shell Holder is a precision-engineered aluminum accessory designed exclusively for Mossberg 500, 590, and Shockwave shotguns. Featuring a built-in Picatinny rail, it allows seamless mounting of optics while holding up to six 12-gauge or seven 20-gauge shells. Installation is quick and tool-free using factory mounting holes, backed by a lifetime warranty—perfect for serious shooters who demand reliability and tactical readiness.

Specifications

ASIN	B07WHN74TW
Best Sellers Rank	#47,747 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #39 in Hunting & Shooting Gun Holders
Brand	Monstrum
Brand Name	Monstrum
Closure Type	Open Top
Color	Black
Customer Reviews	4.6 out of 5 stars 3,751 Reviews
Included Components	SideSaddle
Manufacturer	Monstrum
Manufacturer Part Number	Z83
Material	Aluminum
Material Type	Aluminum
Number of Compartments	1
Number of Items	1
UPC	850004377246
Warranty Description	Lifetime Warranty

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B/.119

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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