---
product_id: 161561204
title: "Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns"
brand: "monstrum"
price: "HK$482"
currency: HKD
in_stock: true
category: "Monstrum"
url: https://www.desertcart.hk/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg
store_origin: HK
region: Hong Kong
---

# Picatinny/Weaver rail compatible Fits Mossberg 500/590/Shockwave Aluminum build, no gunsmithing Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns

**Brand:** monstrum
**Price:** HK$482
**Availability:** ✅ In Stock

## Summary

> 🎯 Lock, Load, and Level Up Your Shotgun Game

## Quick Answers

- **What is this?** Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns by monstrum
- **How much does it cost?** HK$482 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-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.
- • **Versatile Optics Mounting:** Integrated Picatinny rail lets you attach scopes, red dots, or optics for tactical edge and quick target acquisition.
- • **Robust Aluminum Construction:** Durable yet lightweight aluminum ensures long-lasting performance without adding bulk to your setup.
- • **Quick, Tool-Free Installation:** Mounts directly using factory holes with included set screws—no gunsmithing or modifications needed.
- • **Precision Fit for Mossberg Classics:** Seamlessly designed for Mossberg 500, 590, and Shockwave series—no guesswork, just perfect compatibility.

## Overview

The Monstrum Side Saddle Shell Holder with Picatinny Rail Mount 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 features a Picatinny rail for versatile optics attachment. Available in 12 and 20 gauge sizes, it securely holds up to six or seven shells respectively, enhancing reload speed and tactical readiness.

## 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
- 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 | #67,729 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #36 in Hunting & Shooting Gun Holders |
| Brand Name | Monstrum |
| Closure Type | Open Top |
| Color | Tan |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,921) |
| Manufacturer | Monstrum |
| Manufacturer Part Number | Z83 |
| Material Type | Aluminum |
| Number of Compartments | 1 |
| UPC | 850004377246 |

## Product Details

- **Brand:** Monstrum
- **Closure Type:** Open Top
- **Color:** Tan
- **Manufacturer:** Monstrum
- **Material:** Aluminum

## Images

![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 **Style** 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.hk/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg](https://www.desertcart.hk/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-07-06*