The Mossberg 500 Vent Rib Barrel (Mossberg part number 90136) is a 26-inch, all-purpose replacement barrel chambered in 20 gauge, built for the Mossberg 500 and Maverick 88 six-shot models. It pairs a vented rib and a bead sight with a smoothbore, blued-finish tube, and it ships complete with an Accu-Choke set covering Improved Cylinder, Modified, and Full constrictions. That range of chokes makes it a genuinely all-purpose barrel for upland, waterfowl, or clays with a 20 gauge platform.

Key Specifications

• Barrel length is 26 inches.
• Chambered for 20 gauge, with a 3-inch maximum chamber.
• A vented rib runs the length of the barrel to reduce heat mirage.
• A bead sight gives a quick reference for wingshooting.
• The bore is smooth rather than rifled.
• Three Accu-Choke tubes are included, covering Improved Cylinder, Modified, and Full.
• Finish is blued.
• It fits Mossberg 500 and Maverick 88 six-shot models.

Frequently Asked Questions

Does this barrel include chokes? Yes, it ships with a 3-piece Accu-Choke set (Improved Cylinder, Modified, Full).

What gauge is this barrel chambered in? It is chambered in 20 gauge with a 3-inch maximum chamber.

What shotguns does this barrel fit? It fits 20 gauge Mossberg 500 and Maverick 88 six-shot models.

Buy the Mossberg 500 20 Gauge Vent Rib Barrel

Swap in a factory-correct 20 gauge Mossberg barrel and get back in the field without waiting on a gunsmith. Shop the rest of our shotgun barrels lineup and order from our Lubbock, Texas gun shop for fast, direct shipping.