The Mossberg 500 Combo is a 12-gauge pump-action shotgun packaged with two barrels: a 28-inch vent rib barrel for field shooting and an 18.5-inch security barrel for home defense. Capacity is 5+1, chamber size is 3 inches, weight is 7.50 lbs. 
 

Key Specifications: 

• Brand: Mossberg 
• Model: 500 Combo 
• Caliber/Gauge: 12 Gauge 
• Capacity: 5+1 rounds 
• Barrel Lengths: 
  • 28" (field barrel) 
  • 18.5" (security barrel) 
• Weight: 7.50 lbs 
• Overall Length: 
  • 37.50" (Compact Barrel) 
  • 48.50" (Vent Rib Barrel) 
• Chamber Size: 3" 
• Action Type: Pump Action 
• Safety Mechanism: Ambidextrous Top Tang Safety 
   

Detailed Features: 

 
The twin action bars cycle the action smoothly with minimal binding. Dual extractors give reliable cartridge extraction on each pump stroke. The vent rib 28-inch barrel is set up for field and clay shooting; the 18.5-inch security barrel is built for close-range defensive work. Swapping between them requires no tools and takes under a minute. 
 
The wood stock adds structural integrity and an attractive appearance. The top tang safety is ambidextrous, which is a useful feature across the range of Mossberg's 500 series. 
 

Usage Scenarios: 

 
The Combo packages two distinct configurations in one purchase. Bird hunters who also want a dedicated home-defense setup avoid buying a second gun. The 28-inch vent rib handles pheasant, turkey, and clay birds; the 18.5-inch provides the short overall length and fast handling that defensive use demands.

The Mossberg 500 Combo generates consistent positive feedback centered on the dual-barrel value proposition. Owners who wanted both a field gun and a home defense shotgun without buying two separate firearms find the setup practical. Barrel swapping is straightforward and comes up repeatedly as a true convenience rather than a marketing claim.

Reliability is the other dominant positive. The 500 platform's reputation for cycling dependably in varying conditions transfers directly to the Combo. Most owners report no issues with either barrel configuration.

Ergonomics and ease of operation draw favorable marks. The pump action is intuitive, and the ambidextrous safety is well-regarded. Weight at 7.5 lbs is noted by some owners as a mild concern for extended carry, though this is common for the 500 platform.

Customization potential through the wide Mossberg aftermarket is mentioned as a plus. Affordability relative to buying two separate shotguns is the value argument most owners make when recommending the Combo.