---
product_id: 161561204
title: "Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns"
brand: "monstrum"
price: "11870 som"
currency: KGS
in_stock: true
reviews_count: 7
category: "Monstrum"
url: https://www.desertcart.kg/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg
store_origin: KG
region: Kyrgyzstan
---

# Picatinny/Weaver rail mount ready Fits Mossberg 500/590/Shockwave No gunsmithing, easy install Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns

**Brand:** monstrum
**Price:** 11870 som
**Availability:** ✅ In Stock

## Summary

> 🔫 Lock, Load, and Level Up Your Mossberg 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?** 11870 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/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

- • **Rapid Reload Ready:** Securely holds 6 (12 gauge) or 7 (20 gauge) shells with quick-access design—reload faster, stay mission-ready.
- • **Versatile Optics Mounting:** Integrated Picatinny rail lets you attach scopes, red dots, or tactical lights for next-level targeting and customization.
- • **Durable Polymer-Metal Hybrid:** Built to withstand rugged use with premium materials that balance toughness and lightweight performance.
- • **Tool-Included Hassle-Free Setup:** Comes with all screws and Allen wrench—install in under 5 minutes with zero gunsmithing required.
- • **Precision Fit for Mossberg Classics:** Custom engineered for seamless integration with Mossberg 500, 590, and Shockwave series—no compromises on compatibility.

## Overview

The Monstrum Side Saddle Shell Holder is a precision-fit, durable polymer accessory designed exclusively for Mossberg 500, 590, and Shockwave shotguns. Featuring a built-in Picatinny rail, it supports mounting of optics and tactical gear while securely holding 6 or 7 shotgun shells depending on gauge. Installation is quick and tool-assisted, requiring no gunsmithing, making it the ultimate upgrade for professionals and enthusiasts seeking enhanced reload speed and modular customization.

## Description

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

Review: Quality and fit - Good quality. Fit perfect and looks good
Review: "WHEN ORDERING MAKE SURE YOU CLICK ON THE 12 GA OR 20 GA MODEL BEFORE COMPLETING THE PURCHASE". - It installed very easy and fits perfectly. It doesn't cover the safety or go past the chamber over the barrel on a Mossberg 590 12 ga shot gun. The 6 shells are held in tightly yet I didn't have any problem removing the 6 shells and reloading. The bad reviews are not accurate. I read all the negative reviews and was concerned after I purchased the item, but I figured I would give it a shot (Pun intended). I thought if it doesn't fit I will return it but it can't hurt to try it since there are so many good reviews. It goes on so easily I was pleasantly satisfied. It took me 5 minutes to install and I didn't need longer screws or any "LOCK TIGHT" to install it and snug it down securely. All the screws and the allen wrench came in the box that I used to install it. I will say though "WHEN ORDERING MAKE SURE YOU CLICK ON THE 12 GA OR 20 GA MODEL BEFORE COMPLETING THE PURCHASE". I think that is what throws people off to get a negative review because they receive the wrong caliber shell holder (12 ga 6 shell holder or a 20 ga 7 shell holder, that also threw me off in the description compared to the picture provided they have to describe the item on the desertcart page). And they do not realize it until they receive it and some people after receiving it. I ordered the product then had to cancel because it was set on the 20 ga, It was easy to cancel that order and reorder the 12 ga model. I don't have a picture but it fit perfectly on my Mossberg 590 12ga as pictured on other good reviews.. Sturdy metal and polymer material, built to last and take some good hard working abuse !!! I AM VERY HAPPY WITH THIS ITEM , IT IS JUST WHAT I WANTED !! I will order again if I get another Mossberg 500, 590 or 590A1 12 ga.

## 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 | #25,147 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #19 in Hunting & Shooting Gun Holders |
| Brand | Monstrum |
| Brand Name | Monstrum |
| Closure Type | Open Top |
| Color | Tan |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,910) |
| Date First Available | August 13, 2019 |
| Item Package Dimensions L x W x H | 6.89 x 2.83 x 1.61 inches |
| Manufacturer | Monstrum |
| Material | Polymer |
| Number of Compartments | 1 |
| Package Weight | 0.18 Kilograms |
| Part Number | Z83 |
| Style | 12 Gauge |
| UPC | 850004377246 |

## Product Details

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

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality and fit
*by J***F on January 9, 2026*

Good quality. Fit perfect and looks good

### ⭐⭐⭐⭐⭐ "WHEN ORDERING MAKE SURE YOU CLICK ON THE 12 GA OR 20 GA MODEL BEFORE COMPLETING THE PURCHASE".
*by A***R on May 24, 2021*

It installed very easy and fits perfectly. It doesn't cover the safety or go past the chamber over the barrel on a Mossberg 590 12 ga shot gun. The 6 shells are held in tightly yet I didn't have any problem removing the 6 shells and reloading. The bad reviews are not accurate. I read all the negative reviews and was concerned after I purchased the item, but I figured I would give it a shot (Pun intended). I thought if it doesn't fit I will return it but it can't hurt to try it since there are so many good reviews. It goes on so easily I was pleasantly satisfied. It took me 5 minutes to install and I didn't need longer screws or any "LOCK TIGHT" to install it and snug it down securely. All the screws and the allen wrench came in the box that I used to install it. I will say though "WHEN ORDERING MAKE SURE YOU CLICK ON THE 12 GA OR 20 GA MODEL BEFORE COMPLETING THE PURCHASE". I think that is what throws people off to get a negative review because they receive the wrong caliber shell holder (12 ga 6 shell holder or a 20 ga 7 shell holder, that also threw me off in the description compared to the picture provided they have to describe the item on the Amazon page). And they do not realize it until they receive it and some people after receiving it. I ordered the product then had to cancel because it was set on the 20 ga, It was easy to cancel that order and reorder the 12 ga model. I don't have a picture but it fit perfectly on my Mossberg 590 12ga as pictured on other good reviews.. Sturdy metal and polymer material, built to last and take some good hard working abuse !!! I AM VERY HAPPY WITH THIS ITEM , IT IS JUST WHAT I WANTED !! I will order again if I get another Mossberg 500, 590 or 590A1 12 ga.

### ⭐⭐⭐⭐⭐ Exactly What It Says It Is
*by S***S on May 1, 2025*

Amazingly, this product does exactly what it says it will do. First of all, let me comment on the ease of installation. Four long screws take the place of the filler screws on the top of the receiver. This item is in 2 pieces. The Pic rail is one part and the shell holder the second part. The shell holder in held in place by the 4 screws that hold the Pic rail to the receiver. A very secure mount. One thing that is different than the picture of the item is that the bevels are actually beveled down. Shown in the ad the bevels are up. I wondered about that but the one I received had the bevels on the bottom side. As they should be. Love the item and although I would have liked to see it less expensive, it turned out to be well worth the money. I have pictured it mounted on my 590 but they make them for a bunch of tactical shotguns.

## 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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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-10*