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 Mounted 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
Material
Polymer

🎯Picatinny rail for optics

🔫Fits Mossberg 500/590/Shockwave

🛠️No gunsmithing needed install

RM305

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔫 Lock, Load, and Level Up Your Shotgun Game!

ROBUST ALUMINUM BUILD - Durable, lightweight aluminum construction built to withstand rugged use and harsh conditions.
CALIBER SPECIFIC SHELL CAPACITY - Choose 12 gauge (holds 6 shells) or 20 gauge (holds 7 shells) to match your shotgun and never run dry.
INTEGRATED PICATINNY RAIL MOUNT - Mount scopes, red dots, or optics effortlessly to elevate your tactical edge.
PRECISION FIT FOR MOSSBERG SERIES - Seamlessly designed for Mossberg 500, 590, and Shockwave shotguns—no guesswork, just perfect compatibility.
QUICK TOOL INCLUDED INSTALLATION - Install in under 5 minutes with included screws and Allen wrench—no gunsmith required.

The Monstrum Side Saddle Shell Holder is a precision-engineered aluminum accessory designed exclusively for Mossberg 500, 590, and Shockwave series shotguns. Featuring a built-in Picatinny rail, it allows seamless mounting of optics while securely holding 6 or 7 shells depending on caliber. Installation is quick and tool-assisted with no gunsmithing required, making it the ultimate upgrade for professionals and enthusiasts seeking tactical readiness and reliability.

Specifications

ASIN	B07WHN74TW
Best Sellers Rank	#25,280 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #28 in Hunting & Shooting Gun Holders
Brand	Monstrum
Brand Name	Monstrum
Closure Type	Open Top
Color	Tan
Customer Reviews	4.6 out of 5 stars 3,762 Reviews
Manufacturer	Monstrum
Manufacturer Part Number	Z83
Material	Polymer
Material Type	Polymer
Number of Compartments	1
Number of Items	1
Pocket Description	Shell Loop Pocket - 6 open-top, cup-shaped shell loops arranged side by side, molded from polymer with a scalloped front lip; each pocket cradles one 12 gauge shotgun shell and holds it via friction/spring tension around the shell body Pocket Description Shell Loop Pocket - 6 open-top, cup-shaped shell loops arranged side by side, molded from polymer with a scalloped front lip; each pocket cradles one 12 gauge shotgun shell and holds it via friction/spring tension around the shell body See more
UPC	850004377246
Unit Count	1 Count

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