Marlin Model 120 Magnum Field Grade 12 Ga Pump Shotgun, 28" Vent-Rib Barrel, Fixed MOD Choke, 3" Chamber
Built for reliable field performance, this Marlin Model 120 Magnum Field Grade combines a 3-inch chamber with a factory 28-inch vent-rib barrel and fixed Modified choke. Produced in the 1970s (serial prefix “A”) and marked with the JM proof, it features dual action bars, a removable trigger group, and a steel receiver—details that set it apart from many contemporary pump guns. Oil-finished walnut furniture and a matte blued finish complete the classic American sporting look.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
The metal surfaces display scattered scratches, small handling blemishes, and patches of surface rust with finish loss that are consistent with regular field use.
What’s Included
- Marlin Model 120 Magnum Field Grade 12 Ga pump-action shotgun
- Factory 28" vent-rib barrel with fixed Modified choke
- 2+1 capacity plug installed (removable)
This full-size pump shotgun is chambered for both 2 ¾-inch and 3-inch shells, giving you flexibility between standard field loads and heavy magnum rounds. The dual action bars keep the forend stable during cycling, promoting smooth, positive operation even under rapid use.
The 28-inch carbon-steel barrel wears a ventilated rib topped with a single brass bead for a clear sighting plane. A fixed Modified choke lends all-around versatility for upland birds, waterfowl over decoys, and general small-game hunting.
Marlin built the Model 120 with a steel receiver and a removable trigger group for straightforward maintenance. The JM proof stamp on the barrel signifies manufacture at Marlin’s North Haven, Connecticut facility.
Oil-finished walnut stocks feature machine checkering at the grip and forend, plus a recoil pad that shortens felt recoil. The 13.75-inch length of pull suits a wide range of shooters, while the cross-bolt safety provides familiar, intuitive operation.