Rock Island Armory Lion X4 12 Gauge Semi-Auto, 18.5 inch Barrel, Ghost-Ring Sights, Threaded Barrel with Choke Set, Black
This Rock Island Armory (RIA) Lion X4 is a gas-operated 12 gauge semi-automatic shotgun built by Derya Arms in Turkey for RIA Imports. It features an 18.5 inch threaded barrel with an extended ported choke installed, adjustable ghost-ring rear and red fiber-optic front sights, and a receiver that is drilled and tapped with a screw-mounted Picatinny rail (with ghost-ring rear sight) installed. The shotgun includes an interchangeable RIA-marked choke set (Full, Modified, Cylinder) with spanner key, and comes in the factory box with a label that matches the receiver serial.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: Minor scratches and blemishes are present and consistent with light handling.
What’s Included
- RIA-marked interchangeable choke set: Cylinder, Modified, Full, plus spanner key
- Extended ported choke tube installed on the barrel
- RIA Imports factory cardboard box with Lion X4 label and matching serial number
The Lion X4 uses a reliable gas-operated, semi-automatic action with a 3 inch chamber and a 4+1 capacity. With an overall length of about 39.4 inches, a 14.0 inch length of pull, and a weight around 7.1 lb, it balances maneuverability with control for general-purpose 12 gauge use.
Sighting is handled by an adjustable ghost-ring rear and a ramped red fiber-optic front blade for fast alignment. The receiver is drilled and tapped; a screw-mounted Picatinny rail (with ghost-ring rear sight) is installed, and a short accessory rail at 6 o’clock on the forend provides mounting space for compatible accessories.
The 18.5 inch barrel is threaded for an interchangeable choke system. An extended ported tube is installed, and the included RIA-marked set provides Full, Modified, and Cylinder options with the supplied spanner key. This setup adds useful flexibility across loads and distances.
The black polymer stock has a pistol-grip-style wrist and a ventilated rubber recoil pad, with a rear sling stud for carry. The polymer forend features molded grooves and vent slots, plus a large knurled magazine cap for easy disassembly. Controls include a manual safety with a red indicator. Markings include DERYA ARMS – TURKEY, RIA Imports, and proof-tested stamps, and the factory box label matches the receiver serial for documentation continuity.