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
Color
Black
Manufacturer
Monstrum
Material
Aluminum
Number of Items
1

🎯Picatinny rail for optics

🔫Fits Mossberg 500/590/Shockwave

🛠️No gunsmithing needed installation

$119.97

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔫 Elevate your Mossberg game—shells, sights, and speed all in one sleek mount!

DUAL GAUGE OPTIONS - Choose between 12 gauge (holds 6 shells) or 20 gauge (holds 7 shells) to match your shotgun and ammo needs.
TOOL FREE INSTALLATION - Mounts effortlessly using factory holes with included set screws—skip the gunsmith and get shooting faster.
INTEGRATED PICATINNY RAIL - Add scopes, red dots, or optics directly on the shell holder for tactical advantage and quick target acquisition.
PRECISION FIT FOR MOSSBERG SERIES - Seamlessly designed for Mossberg 500, 590, and Shockwave shotguns—no guesswork, just perfect compatibility.
DURABLE ALUMINUM BUILD WITH LIFETIME WARRANTY - Crafted from lightweight yet rugged aluminum, backed by a lifetime warranty—gear up with confidence.

The Monstrum Side Saddle Shell Holder 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 includes a Picatinny rail for mounting optics. Available in 12 and 20 gauge sizes, it securely holds up to six or seven shells respectively, combining ammo storage and tactical versatility in one durable package backed by a lifetime warranty.

Specifications

ASIN	B07WHN74TW
Best Sellers Rank	#36,629 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #35 in Hunting & Shooting Gun Holders
Brand Name	Monstrum
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (3,751)
Included Components	SideSaddle
Manufacturer	Monstrum
Manufacturer Part Number	Z83
Material Type	Aluminum
Number of Compartments	1
Number of Items	1
UPC	850004377246
Warranty Description	Lifetime Warranty

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TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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$119.97

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered 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 Ecuador.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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