---
product_id: 161561204
title: "Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns"
brand: "monstrum"
price: "R$616"
currency: BRL
in_stock: true
category: "Monstrum"
url: https://www.desertcart.com.br/products/161561204-monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-mossberg
store_origin: BR
region: Brazil
---

# Picatinny rail for optics Fits Mossberg 500/590/Shockwave No gunsmithing needed installation Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns

**Brand:** monstrum
**Price:** R$616
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns by monstrum
- **How much does it cost?** R$616 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/161561204-monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-mossberg)

## Best For

- monstrum enthusiasts

## Why This Product

- Trusted monstrum brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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.

## Overview

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.

## Description

desertcart.com : Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns | 12 Gauge : Sports & Outdoors

## Features

- 100% Weave
- Imported
- Built for use with Mossberg 500, 590, and Shockwave Series shotgun models
- Not compatible with Mossberg 500 Bantam, Mossberg 500 Combo, Mossberg 500 Flex Models or models where the pump action extends past the receiver when pumped. See attached infographic before purchasing. Pre-1997 Mossberg shotguns were manufactured with a different mounting hole pattern and will require 6x48TPI screws (not included).
- Shell holder available in two sizes - 12 gauge saddle accomodating up to six 12 gauge shells and 20 gauge saddle accomodating up to seven 20 gauge shells
- Rail mount allows for the mounting of Picatinny or Weaver standard scopes, red dots, or other optics
- Installs via included set screws into the Mossberg factory mounting holes with no additional gunsmithing required

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

- **Brand:** Monstrum
- **Color:** Black
- **Manufacturer:** Monstrum
- **Material:** Aluminum
- **Number of Items:** 1

## Images

![Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns - Image 1](https://m.media-amazon.com/images/I/619vpJD7W5L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Will this mount to the mossberg maverick 88 12g?**
A: 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?**
A: 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?**
A: I have a 590 shockwave 12 gauge and fit and works great

**Q: Will this fit a mossberg 940?**
A: It has predrilled holes that makes it compatible with almost all shotguns, so yes.

## 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

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**Shop now:** [https://www.desertcart.com.br/products/161561204-monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-mossberg](https://www.desertcart.com.br/products/161561204-monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-mossberg)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-09-19*