Advanced Technology Intl Side Saddle Gen 2 MRW - Tactical Shotgun Shell Holder for Enhanced Ammunition Access

The ATI Outdoors Side Saddle Gen 2 MRW is a tactical shotgun shell holder designed to mount directly to your receiver, giving you quick, reliable access to extra ammunition during tactical drills, sport shooting, or home defense scenarios. This is the direct-fit version engineered for Mossberg 500 and 590 shotguns with tapped receivers—just clamp it on and you're ready to go. The skeletonized aluminum design keeps weight minimal while the integrated top rail opens up mounting options for lights, lasers, or other tactical gear.

Built from CNC-machined 6061 T6 aluminum and finished with military-grade Type III hard anodizing, the Gen 2 MRW won't quit in harsh conditions. The real win here is configurability: you get nine shell-holding positions, but you only populate the ones you need. Want four rounds on one side and five on the other? Done. Need room for something else? Leave slots empty. The reinforced synthetic shell holders stay put wherever you clamp them, and the whole assembly is light enough that you won't notice it hanging on your gun.

Mossberg 500 and 590 owners with tapped receivers get a direct bolt-on fit. If you're running a Maverick 88, Remington 870, or Winchester SXP, the Gen 2 will work—but expect to do some fitting work. This isn't a universal solution, and ATI doesn't hide that. Take care during installation: over-tightening screws can strip the aluminum, so snug them down firm but not gorilla-tight.

Key Features

• CNC-machined 6061 T6 aluminum with military Type III hard anodize finish for durability in field conditions
• Direct fit for Mossberg 500/590 12GA with tapped receiver; compatible with modifications on Maverick 88, Remington 870, and Winchester SXP
• Nine customizable shell-holding positions—load as many or as few rounds as your mission requires
• Integrated top rail for mounting optics, lights, or other tactical accessories
• Skeletonized design minimizes weight and sight obstruction
• Reinforced synthetic shell holders clamp securely in any configuration

Specifications

Frequently Asked Questions

Will this fit my Mossberg 500 or 590?

Yes—direct fit if your receiver is tapped. If you're not sure whether yours is tapped, check with your manufacturer or gunsmith. The tapped holes are what let you bolt this on without drilling.

Can I use this on a Remington 870 or other shotgun?

The Gen 2 MRW is designed for direct installation on tapped Mossberg 500/590 receivers. It can work on a Maverick 88, Remington 870, or Winchester SXP, but you'll need to do some fitting—this isn't a guaranteed bolt-on for those models. Check compatibility with ATI or your gunsmith before purchase if you're using a different shotgun.

Can I customize how many shells I carry?

Absolutely. You have nine positions available, but you only populate the ones you need. Install two, install all nine, or anything in between—it's your call based on your mission or preference.

What should I know about installation?

Don't over-tighten the mounting screws. The aluminum can strip if over-torqued, and stripped holes or broken screw heads aren't covered under warranty. Snug them down firm, but use restraint.