Mossberg 500A 12 Gauge Pump-Action, 18.5 in Cylinder Bore, 3 in Chamber, Heat Shield, 4+1 Capacity
This Mossberg 500A is a U.S.-made, full-size 12-gauge pump built around an 18.5-inch steel barrel with a true cylinder bore and a 3-inch chamber. It features a perforated heat shield, a rugged synthetic stock and fore-end, and straightforward brass bead sights. It also carries North Haven, Connecticut factory markings that collectors and Mossberg enthusiasts will recognize.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: This firearm shows considerable exterior wear throughout.
What’s Included
- Mossberg 500A 12 Gauge pump-action shotgun
The 18.5-inch barrel uses a cylinder bore, delivering even patterns at close range and keeping operation simple. A 3-inch chamber provides flexibility with a wide range of 12-gauge loads. Capacity is 4+1, maintaining the classic 500A profile and handling.
A perforated steel heat shield spans the barrel, aiding control during extended strings of fire. A single brass bead front sight offers a clean, fast reference without distractions, consistent with the model’s purpose-built layout.
The synthetic furniture includes a black stock with a ventilated recoil pad and a rear sling swivel stud, paired with a ribbed synthetic fore-end for a secure grip. Length of pull is 14.0 inches, fitting the full-size configuration.
The shotgun wears a blued/black finish on both receiver and barrel. The receiver is rollmarked "Mossberg, Made in U.S.A., North Haven, Conn.; 500A 12 GA," and the barrel carries the Mossberg safety-warning rollmark with the North Haven, CT address. A circular proof/inspection mark is present on the receiver, further confirming factory provenance.