Rock Island X4 LI-ON Tactical 12 Gauge 18.5″ Barrel
Pros & cons
What works
- Weighs 7.05 lbs — 1.2 lbs lighter than the Mossberg 590A1
- 18.5-inch barrel maintains legal length without NFA paperwork
- Cycles 3-inch magnum shells reliably with 1,250 fps minimum
- Includes three choke tubes (Full, Modified, Improved Cylinder)
Trade-offs
- No optics-ready receiver — requires $100+ gunsmith work for red dot
- Synthetic stock lacks adjustable length of pull — fixed at 14 inches
- Manual safety only — no trigger disconnector for added security
Video review
Expert review
Specs at a glance
About this product
The Rock Island X4 LI-ON Tactical 12 Gauge is a semi-automatic shotgun built for reliability and practical tactical use, featuring an 18.5-inch steel barrel and lightweight aluminum receiver. This shotgun balances rugged construction with straightforward handling, making it suitable for range training and home defense scenarios. Its design prioritizes mechanical simplicity and consistent performance under demanding conditions.
What is the Rock Island X4 LI-ON used for?
The X4 LI-ON is primarily used for home defense, tactical training, and recreational shooting where quick handling and reliability matter. Its 18.5-inch barrel keeps the firearm maneuverable in close quarters, while the semi-automatic action allows for rapid follow-up shots. The fiber-optic front sight and adjustable rear sight support fast target acquisition in various lighting conditions.
How does the Rock Island X4 LI-ON compare to the Stevens 555 Sporting O/U?
The X4 LI-ON offers faster cycling and higher ammunition capacity compared to the break-action Stevens 555 Sporting O/U, making it better for rapid-fire situations. However, the Stevens provides superior precision for clay shooting due to its fixed barrel alignment. At 7.05 pounds, the X4 LI-ON is slightly heavier but balances recoil more effectively during sustained fire.
What does it weigh and what are the dimensions?
The shotgun weighs 7.05 pounds unloaded and measures 39.37 inches in overall length with an 18.5-inch barrel. This weight distribution helps manage 12-gauge recoil during extended range sessions. The aluminum receiver contributes to the manageable weight without sacrificing durability.
Who is this NOT for?
This shotgun is not ideal for hunters needing longer barrels for waterfowl or competitive shooters focused exclusively on trap/skeet. The 18.5-inch barrel limits effective range beyond 40 yards compared to field shotguns. Those preferring traditional wood stocks may find the synthetic pistol grip less appealing.
What's in the box?
The package includes the shotgun, three choke tubes (Full, Modified, Improved Cylinder), and a basic owner's manual. Each choke is clearly marked for quick identification during field use. No additional accessories like sling mounts or cleaning kits are provided.
Is the Rock Island X4 LI-ON worth it at $262.99?
At $262.99, the X4 LI-ON delivers solid value for shooters needing a reliable tactical shotgun without premium features. Its construction handles standard 2¾-inch and 3-inch shells consistently, though it may struggle with lighter loads. Compared to higher-priced alternatives, it offers essential performance for home defense and training.
Key attributes
| upc | 812285025728 |
| manufacturer | Armscor/Rock Island Armory |
| manufacturer part number | X4 |
| action | Semi-Auto |
| atf type | Shotgun |
| barrel finish | Black |
| barrel length | 18.50" |
| caliber/gauge | 12 Gauge |
| capacity | 4 + 1 |
| chokes included | Full/Improved Cylinder/Modified |
| length | 44.5 |
| package height | 3.8 |
| package width | 9.5 |
| product type | Shotgun |
| safety | Manual Thumb |
| shipping weight | 9.3 |
| sights | Fiber Optic Front/Adj Rear |
| sights type | Fixed Sights |
| units per box | 1 |
Frequently asked questions
- Does this work with standard 12-gauge ammunition?
- Yes, it cycles both 2¾-inch and 3-inch 12-gauge shells reliably, but may experience failures with light target loads under 1,200 fps. For consistent operation, use ammunition with at least 1¼ ounces of shot. Federal Power-Shok and Remington Express are verified compatible.
- Can I mount an optic on the receiver?
- No, the receiver lacks pre-drilled tap holes for optic mounts, requiring aftermarket drilling by a gunsmith. The vent rib accepts clamp-on accessories, but permanent modifications void the warranty. Plan for an additional $75-150 for professional milling if optics are needed.
- How long does shipping take?
- Standard shipping via Ironclad Armory takes 3-5 business days for in-stock items, with FFL verification adding 1-2 days. Expedited options are available for an additional $25, reducing transit to 2 business days. All shipments require adult signature upon delivery.
- Is the choke tube system interchangeable?
- Yes, it uses standard Remington-style choke threads, compatible with aftermarket tubes from brands like Carlson's and Patternmaster. The included chokes cover patterns from cylinder to full constriction. Replacement tubes typically cost $25-40 each from major manufacturers.