Standard Manufacturing DP-12 12 Gauge Double-Barrel Bullpup Pump Shotgun, 18.5" CYL Bore, 2 3/4" and 3" Chamber
The Standard Manufacturing DP-12 is a double-barrel, bullpup pump-action shotgun built for compact handling and high on-board capacity. This example features 18.5" cylinder bore barrels, chambers for 2 3/4" or 3" shells, bottom loading and ejection, and a single trigger that fires the two barrels sequentially. It includes full-length top and short bottom Picatinny rails, an installed vertical foregrip, and an aluminum receiver marked with U.S. Patent 9,115,954.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Specific Condition Notes: There are signs of wear and handling, including scratches and blemishes.
What’s Included
- Standard Manufacturing DP-12 12 gauge shotgun
- Installed vertical foregrip
This DP-12 uses a bullpup layout to keep overall length to about 29.5" while retaining twin magazine tubes and dual 18.5" cylinder bore barrels. It is chambered for 2 3/4" or 3" shells and employs a single trigger with sequential firing, paired with a manual safety.




