Imported by Blue Line Solutions, one of the most affordable pump-action shotguns available today is simply called the Blue Line Pump. The manual gets a little more specific with a Model PD 18 SB designation. If it looks familiar, perhaps it is because the gun is a dimensional clone of the venerable Remington Model 870, save for the lines of the trigger guard. That is likely because any patent protections that existed on the Remington Model 870 have long since expired; after all, the design has been around since 1950.

Brand: Blue Line Solutions
Model: BL-18
Type: Shotgun
Caliber: 12 Gauge
Finish: Black
Action: Pump Action
Stock: Synthetic, Black
Sight: Bead Sight (no ventilated rib)
Barrel Length: 18.5"
Overall Length: 38.5"
Weight: 7.94 lbs
Capacity: 5+1
Receiver: Black
Chamber: 3
Chokes: Cylinder Bore

* Accepts 870 Furniture. Does not accept 870 barrels.

Review of the Blue Line Pump 12 Gauge Shotgun from American Rifleman: https://www.americanrifleman.org/content/review-blue-line-pump-12-gauge-shotgun