The Mossberg 940 Pro Tactical is a 12 gauge semi-auto shotgun (Mossberg part no. 85163) built around Mossberg’s fast-cycling 940 platform for defensive and competition-style use. Its 18.5-inch barrel keeps the gun quick to bring on target in tight spaces, and the 3-inch chamber handles both standard and magnum 12 gauge loads. The receiver comes cut for direct, low-profile mounting of Shield RMSc-pattern micro dot sights, so you get a faster sight picture without a separate mounting plate. Finished in black from the receiver to the synthetic stock, it’s built as a straightforward, no-frills defensive shotgun.

Key Specifications

• Chambered in 12 gauge for shells up to 3 inches.
• The 18.5-inch barrel gives fast, close-quarters handling.
• Magazine capacity of 4 rounds in the tube, plus one in the chamber.
• The receiver is cut for direct, low-profile mounting of Shield RMSc-pattern micro dot sights.
• Ships at approximately 9.7 lbs.
• A black finish covers the receiver and synthetic stock for a no-frills defensive build.

Frequently Asked Questions

Can I add a red dot without a mounting plate? Yes — the receiver is cut to directly accept Shield RMSc-pattern micro dot sights for a lower, faster sight picture.

What is the magazine capacity? It holds 4 rounds in the tube, plus one in the chamber when loaded.

What shells does it run? The 3-inch chamber handles both 2-3/4-inch and 3-inch 12 gauge shells.

Buy the Mossberg 940 Pro Tactical 12 Gauge Shotgun 18.5-inch

The direct-mount optic cuts and fast-running 940 action make this one of the more capable defensive shotguns Mossberg builds. Browse more semi-auto shotguns in our lineup, or order this one directly from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.