--- product_id: 161561204 title: "Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns" brand: "monstrum" price: "€ 64.68" currency: EUR in_stock: true reviews_count: 8 category: "Monstrum" url: https://www.desertcart.it/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg store_origin: IT region: Italy --- # Picatinny/Weaver rail mount Fits Mossberg 500/590/Shockwave No gunsmithing needed install Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns **Brand:** monstrum **Price:** € 64.68 **Availability:** βœ… In Stock ## Summary > πŸ”« Reload faster, aim smarter, dominate every shot. ## 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?** € 64.68 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/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 - β€’ **Optics-Ready Rail:** Mount scopes, red dots, or other optics with integrated Picatinny/Weaver rail - β€’ **Durable Polymer Build:** Lightweight yet rugged construction designed to withstand heavy use - β€’ **Tailored Compatibility:** Specifically engineered for Mossberg 500, 590, and Shockwave series (check model fit) - β€’ **Effortless Installation:** Attaches via factory mounting holesβ€”no gunsmithing or modifications required - β€’ **Ready for Rapid Reloads:** Securely holds 6 (12ga) or 7 (20ga) shells for instant access ## Overview The Monstrum Side Saddle Shell Holder is a precision-engineered polymer accessory designed exclusively for Mossberg 500, 590, and Shockwave shotguns. It securely holds up to six 12-gauge or seven 20-gauge shells while providing a Picatinny/Weaver rail for mounting optics. Installation is quick and tool-free, utilizing factory mounting holes with no gunsmithing needed. This accessory enhances reload speed and tactical versatility, making it a must-have for home defense and hunting enthusiasts alike. ## Description desertcart.com : Monstrum Side Saddle Shell Holder with Picatinny Rail Mount for Mossberg 500/590/Shockwave Series Shotguns | 12 Gauge : Sports & Outdoors Review: Icing on the Cake - Monstrum is the finishing touch! Bird head grip, factory head shield, and now the Monstrum rail and side saddle. NICE! Good price with the $5 discount code and easy installation. This will last for years. I’m a very satisfied customer! Review: A must-have for any shotgun - For a home defense shotgun this is a must-have accessory. It enables you to carry extra ammo while also providing a mounting platform for powered optics, such as a red dot. Most shotguns have limited ammo capacity, and you're not going to have time to grab extra shells if you hear a bump in the night. Having those extra shells already mounted to the gun gives you the opportunity to reload, which could be a lifesaver in a hostile encounter. This product surprised me with its quality and price point. It works great, fits great, holds up well under heavy use, and looks awesome to boot. Buy one - you won't be disappointed. It will fit the Mossberg 590 shockwave. Be sure to order the correct version - there are options for 12ga and 20ga. In order to install this product your shotgun must have a drilled & tapped receiver - in other words, little flat-head screws running down the top centerline of the gun. You may consider installing a larger front sight, because this product adds a little extra height to the receiver, and may make it difficult to aim with a standard bead... or just get a red dot and install it on the rail. Also consider using loctite when you install to prevent the screws from loosening under strain from recoil. ## 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 | #34,203 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #27 in Hunting & Shooting Gun Holders | | Brand Name | Monstrum | | Closure Type | Open Top | | Color | Tan | | Customer Reviews | 4.6 4.6 out of 5 stars (3,920) | | Manufacturer | Monstrum | | Material Type | Polymer | | 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 ### ⭐⭐⭐⭐⭐ Icing on the Cake *by M***N on April 3, 2026* Monstrum is the finishing touch! Bird head grip, factory head shield, and now the Monstrum rail and side saddle. NICE! Good price with the $5 discount code and easy installation. This will last for years. I’m a very satisfied customer! ### ⭐⭐⭐⭐⭐ A must-have for any shotgun *by B***. on September 19, 2021* For a home defense shotgun this is a must-have accessory. It enables you to carry extra ammo while also providing a mounting platform for powered optics, such as a red dot. Most shotguns have limited ammo capacity, and you're not going to have time to grab extra shells if you hear a bump in the night. Having those extra shells already mounted to the gun gives you the opportunity to reload, which could be a lifesaver in a hostile encounter. This product surprised me with its quality and price point. It works great, fits great, holds up well under heavy use, and looks awesome to boot. Buy one - you won't be disappointed. It will fit the Mossberg 590 shockwave. Be sure to order the correct version - there are options for 12ga and 20ga. In order to install this product your shotgun must have a drilled & tapped receiver - in other words, little flat-head screws running down the top centerline of the gun. You may consider installing a larger front sight, because this product adds a little extra height to the receiver, and may make it difficult to aim with a standard bead... or just get a red dot and install it on the rail. Also consider using loctite when you install to prevent the screws from loosening under strain from recoil. ### ⭐⭐⭐⭐⭐ Great ad on to a 590 *by S***E on February 13, 2026* Works great,Easy install and fit was good. ## 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.it/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg](https://www.desertcart.it/products/161561204-side-saddle-shell-holder-with-picatinny-rail-mount-for-mossberg) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-04-23*