Mossberg 93356 12 Gauge 18.5" Security Barrel w/ Bead Sight & Breacher, Fits Remington 870 (Excludes 3.5" Magnum)

The Mossberg 93356 is a direct-fit 12 gauge replacement barrel purpose-built for Remington 870 shotguns that need a short, maneuverable setup for home defense or tactical work. At 18.5 inches with a cylinder bore choke and a simple bead sight, this barrel transforms an 870 into a fast-handling defensive tool without the need to swap the entire gun. It's the kind of upgrade that makes sense if you're running a full-length hunting or sport barrel on your 870 and want a dedicated home-defense configuration without buying a second shotgun.

The breacher profile and compact length prioritize close-quarters performance, where split-second target acquisition and maneuverability matter most. The bead sight keeps things simple and reliable—no electronics, no moving parts to fail when you need the gun to work. Cylinder bore means tight patterns are sacrificed for maximum flexibility; you're not constrained to a single shot type and can run buckshot, slugs, or less-lethal loads without choke tube swaps. The matte blued finish handles duty use without demanding babying.

Fit is critical with barrel swaps, and this one is engineered to drop into standard Remington 870 12 gauge receivers—but note that it is not compatible with the 870 3.5" Magnum variant. If you're working with a standard 2.75" or 3" chamber 870, this barrel is a straightforward bolt-on upgrade that opens up a whole new role for a gun you already know.

Key Features

• 18.5" barrel optimized for close-quarters handling and rapid target transitions
• Cylinder bore for pattern flexibility across buckshot, slug, and specialty ammunition
• Bead sight for fast, simple aiming without electronic dependencies
• Matte blued finish suitable for duty and defensive use
• Direct fit for Remington 870 standard 12 gauge receivers

Specifications

Frequently Asked Questions

Will this barrel fit my Remington 870?

Yes, it's designed as a direct fit for standard Remington 870 12 gauge receivers. However, it does not fit the 870 3.5" Magnum variant—if you own the magnum version, this barrel is not compatible.

What's the difference between this and my current 870 barrel?

This is an 18.5" breacher barrel with a cylinder bore, designed for close-range defensive use. It's significantly shorter and more maneuverable than full-length hunting barrels, and the cylinder bore gives you flexibility to use different ammunition types without choke tube changes.

Can I use different types of ammunition with the cylinder bore?

Yes. Cylinder bore means no choke restriction, so you can run buckshot, slugs, or specialty loads depending on your needs without swapping chokes or barrels.