The Standard Manufacturing DP-12 is a pump-action shotgun in 12 GA with a double-barrel layout. Each pump cycles both barrels, so one pump action fires two shells before requiring a second stroke. It holds 14 rounds in the magazines plus 2 in the chambers, for a total of 16 loaded rounds. 
 

Key Specifications 

• Model: DP-12 
• Manufacturer: Standard Manufacturing 
• Caliber: 12 GA 
• Barrel Length: 18.5 inches (18 7/8" barrels) 
• Overall Length: 29.5 inches 
• Weight: 9.8 lbs (unloaded) 
• Capacity: 14 rounds + 2 in chamber (totaling up to 16 rounds) 
• Finish: Black synthetic stock and receiver 
• Action Type: Pump Action 
   

Detailed Features 

The double-barrel configuration is the defining characteristic. With two barrels firing consecutively on each pump stroke, you get rapid follow-up shots without a complex mechanism. The ambidextrous safety and pump slide release work for both left- and right-handed shooters without modification. Multiple Picatinny rails across the top and sides allow lights, optics, or other accessories. The co-molded non-slip rubber grip helps with control, and the spring-loaded system helps absorb recoil. 
 
At 9.8 lbs. unloaded, the DP-12 is heavier than most pump shotguns. That's partly the dual barrel and magazine tube setup. The 29.5-inch overall length is shorter than a standard 18.5-inch barrel single-tube shotgun because of how the layout is configured.

The DP-12 draws strong interest for its novelty -- a pump shotgun that fires two barrels per stroke is genuinely unusual and that's most of what drives the enthusiasm in user discussions. Owners who run it for home defense or tactical use like the high capacity (up to 16 rounds loaded) and the rapid-fire potential.

The tactical appearance is a selling point for some buyers and irrelevant to others, but it at least doesn't generate complaints.

The honest criticisms are consistent across discussions. Weight is the main one: 9.8 lbs. unloaded is heavy, and it becomes noticeable on extended range sessions or if you're handling it in a real-stress scenario. The operating pattern -- pump to fire twice, then pump again -- has a learning curve compared to standard pump shotguns, and some users find it takes adjustment to run reliably under stress. Cycling issues and jams come up occasionally, with some users reporting sensitivity to certain ammo types or requiring a firm pump to cycle cleanly.

Overall, it's a novel shotgun that works as advertised for most owners but asks you to accept the weight and the learning curve. People who've internalized the manual of arms tend to be satisfied; people who expected it to feel like a regular Mossberg generally aren't.