Mossberg 600AT Pump Action Shotgun

Description:
The Mossberg 600AT (often branded as New Haven) is a 12-gauge pump-action shotgun manufactured by O.F. Mossberg & Sons. Essentially a store-brand variant of the Mossberg 500, it features a reliable dual-action bar, a 5+1 tubular magazine capacity, and an easy-to-reach top-tang safety. 
Key Specifications & Features

• Caliber: 12-Gauge
• Action: Pump-action
• Chamber: 3-inch (handles both 2-3/4" and 3" shells)
• Barrel Lengths: 28 inches
• Capacity: 5+1
• Sights: Standard brass bead front sight
• Safety: Ambidextrous top-tang safety located on the receiver
• Materials: Blued steel finish with checkered hardwood stock and forend 

Core Design & Functionality
Produced primarily in the 1970s and 1980s, the 600AT was marketed under the "New Haven" name (a Mossberg promotional brand) for major retail chains like Montgomery Ward and Western Auto. 
Because it is fundamentally a Mossberg 500 derivative, it shares nearly all internal components and accepts the same aftermarket barrels and accessories. It utilizes dual extractors and twin action bars to ensure reliable, non-binding cycling of rounds. 
Barrel & Choke Configuration

• Vent Rib Barrels: Popular for trap shooting and bird hunting.
• Choke Systems: Many models are equipped with the Mossberg Accu-Choke system or the adjustable C-Lect-Choke, which allow you to manually adjust the spread of the shot (from Full to Improved Cylinder) without needing to swap out choke tubes. 

 

Shotgun Gauge: 12 Gauge
Manufacturer: Mossberg
Model: 600AT
Barrel Length: 28 inches
Condition: Very Good

Price: $300.00
Shipping: $45.00