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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

Q: 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. :(

Q: 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.

Q: Is this good for 590 shockwave 20 gauge?

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

Q: Will this fit a mossberg 940?

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

Product ID: 161561204

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Details

Color
Tan
Brand
Monstrum
Closure Type
Open Top
Manufacturer
Monstrum
UPC
850004377246

🎯Picatinny/Weaver rail mount ready

🔫Fits Mossberg 500/590/Shockwave

🛠️No gunsmithing, easy install

Frequently Bought Together

Monstrum Side Saddle Shell Holder for Mossberg 500/590/Shockwave Series Shotguns

ZOEKIM Tactical Grip Glove for Mossberg 590 500 Shockwave Accessories & Remington Tac-14 Rubber Grip Sleeve

XXTACMM Enhanced Slide Safety for Mossberg 500 590 835 930 Shockwave Accessories Aluminum 5 Color Option

Description

🎯 Lock, Load, and Level Up Your Shotgun Game

DUAL GAUGE CAPACITY - Choose between 12 gauge (holds 6 shells) or 20 gauge (holds 7 shells) to match your loadout perfectly.
TOOL FREE INSTALLATION - Install quickly using factory mounting holes and included set screws—no gunsmithing needed, no downtime.
VERSATILE OPTICS COMPATIBILITY - Mount your favorite red dots, scopes, or optics effortlessly on the Picatinny/Weaver rail for tactical advantage.
DURABLE WEAVE BUILD CONSTRUCTION - Crafted from 100% WeaveBuilt materials for rugged durability that stands up to the field and the range.
PRECISION FIT FOR MOSSBERG SERIES - Custom-designed for Mossberg 500, 590, and Shockwave models—seamless integration without compromise.

The MonstrumSide Saddle Shell Holder is a precision-engineered accessory tailored for Mossberg 500, 590, and Shockwave shotguns. Featuring a Picatinny/Weaver rail mount, it supports a variety of optics for enhanced targeting. Available in 12 and 20 gauge sizes, it holds up to 6 or 7 shells respectively. Installation is straightforward with included set screws and factory mounting holes—no gunsmithing required. Built from durable 100% WeaveBuilt materials, this shell holder combines rugged reliability with tactical versatility.

Specifications

Color	Tan
Brand	Monstrum
Closure Type	Open Top
Manufacturer	Monstrum
UPC	850004377246
Number of Compartments	1
Item Package Dimensions L x W x H	6.89 x 2.83 x 1.61 inches
Package Weight	0.18 Kilograms
Brand Name	Monstrum
Part Number	Z83
Style	12 Gauge

Have a Question? See What Others Asked

Will this mount to the mossberg maverick 88 12g?

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

Is this good for 590 shockwave 20 gauge?

Will this fit a mossberg 940?

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