Kel-Tec RFB18 .308/7.62 NATO Bullpup Rifle – Green
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About this product
The Kel-Tec RFB18 is a semi-automatic .308/7.62 NATO bullpup rifle that packs full-power cartridge performance into a uniquely compact 26.1-inch overall length, thanks to its forward-ejection system and fully ambidextrous controls.
Designed for shooters who need a full-power rifle in a package more commonly associated with intermediate cartridges, the RFB18 places its action behind the pistol grip to shorten the overall footprint without sacrificing barrel length. The forward-ejection system is the critical innovation, using a chute to direct spent cases forward and out of a port near the muzzle, completely sidestepping the typical bullpup headache of hot brass near your face or the extensive reconfiguration needed for left-handed shooting.
What is the Kel-Tec RFB18 used for?
The RFB18 is used for scenarios demanding a compact, full-power rifle where shot placement and maneuverability in tight spaces are prioritized over sustained high-volume fire.
Its 18.5-inch barrel provides respectable ballistic efficiency for medium-range engagements, making it a viable option for hog hunting in dense brush or as a compact defensive rifle for suitable jurisdictions. The adjustable gas system, with its 6-position regulator, allows you to tune for standard loads, underpowered steel-case ammo, or heavy subsonic rounds when paired with a suppressor, adding a layer of versatility for the tinkerer.
How does the Kel-Tec RFB18 compare to the Stevens 334?
The Kel-Tec RFB18 offers a significantly more compact profile and forward-ejection for ambidextrous use, while the Stevens 334 provides a more traditional, proven bolt-action design at roughly half the cost.
For a shooter prioritizing a fast-handling, semi-automatic .308 in a package over 7 inches shorter than a typical AR-10, the RFB18 is the clear choice. However, for pure, consistent accuracy from a supported position or for budget-minded hunters, the Stevens 334's bolt-action design and $800-$900 price point make it better suited for those roles. The RFB18 demands a different mastery, centering on managing the bullpup trigger's inherent mechanics and the rifle's distinct balance point directly over the pistol grip.
What does it weigh and what are the dimensions?
The RFB18 weighs 8.7 pounds unloaded and has an overall length of 26.1 inches with an 18.5-inch barrel.
Its compactness is the headline: it's over a foot shorter than a standard 20-inch-barreled AR-10 platform, which typically measures around 39 inches overall. The bullpup configuration shifts most of that 8.7-pound mass rearward, creating a balance point that feels rear-biased compared to traditional rifles. This can aid in rapid target transitions but requires adaptation for supported firing, as the forend is primarily a handguard, not a primary weight-bearing surface.
Who is this NOT for?
This rifle is not for first-time shooters, those on a tight budget, or anyone unwilling to adapt to a bullpup's unique manual of arms and trigger feel.
If your primary goal is benchrest precision or you require a standardized manual of arms identical to an AR-15 or similar platform, look elsewhere. The RFB18's trigger, while serviceable, has a distinct, spongy break and a long reset characteristic of most bullpups linked via a transfer bar. Furthermore, its $1,749.99 price point and specialized design place it in a niche; a budget-conscious buyer would be better served by a traditional bolt action or a more common semi-automatic platform for that investment.
What's in the box?
The rifle ships with one 20-round FAL-pattern steel magazine, a birdcage flash hider, and owner's documentation.
You'll need to source your own optics, rings, and a sling. Note that while it includes a full-length top Picatinny rail, the lack of side or bottom rail sections on the synthetic forend means light, laser, or bipod mounting requires an aftermarket accessory or rail segment. The single included magazine is a start, but given the rifle's compatibility with widely available FAL magazines, building a reserve is straightforward and recommended.
Is the Kel-Tec RFB18 worth it at $1749.99?
At $1,749.99, the RFB18 is worth it for the shooter who specifically needs the unique combination of a semi-automatic .308 in a sub-27-inch package with true ambidextrous operation.
You are paying a premium for Kel-Tec's innovative forward-ejection solution and the compact form factor it enables. If that specific capability—a full-power, lefty-friendly rifle without modification—is your requirement, the price is justified. If a compact profile is merely a "nice-to-have," more conventional and often more refined options exist at or below this price. Consider it a tool for a specific job, not a general-purpose rifle.
Specs at a glance
Pros & cons
What works
- 26.1-inch overall length - over 12 inches shorter than a typical 20-inch AR-10
- True ambidextrous operation via forward ejection - requires zero modification for left-handed shooters
- Accepts common, affordable FAL-pattern magazines - compatibility with a proven, widely available magazine system
- 6-position adjustable gas block - allows fine-tuning for suppressed fire, steel case, or standard loads
Trade-offs
- Bullpup trigger has a long, spongy reset - a 0.5-inch trigger pull with noticeable stacking before a mushy break
- Limited rail real estate - only a top Picatinny rail is included; no M-LOK or side rails on the forend
- Disassembly is more complex than an AR platform - requires a detailed field strip for routine cleaning of the gas piston and ejection chute
Key attributes
| upc | 640832007510 |
| manufacturer | KelTec |
| manufacturer part number | RFB18GRN |
| action | Semi-Auto |
| atf type | RIFLE |
| barrel length | 18" |
| caliber/gauge | .308 / 7.62 NATO |
| capacity | 20 + 1 |
| color | Black |
| length | 30.1500 |
| number of magazines | 1 20 rd. |
| package height | 2.7 |
| package width | 10.3 |
| product type | Rifle |
| safety | Ambidextrous |
| shipping weight | 11.1 |
| sights | No |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with PMAGs or other AR-10 magazines?
- No, the RFB18 is not compatible with Magpul PMAGs (SR-25/LR-308 pattern) or other common AR-10 magazines. It is designed specifically to accept metric pattern FAL magazines, such as those from DSA or other manufacturers producing FAL-type steel or polymer mags.
- Does it fit in a standard rifle case?
- Yes, due to its 26.1-inch overall length, the RFB18 will fit comfortably in many compact rifle cases or shorter standard cases designed for AR-15s with collapsed stocks. A case with a 28-inch internal length provides a snug, secure fit.
- How long does shipping take?
- For in-stock items like this, standard processing time at Ironclad Armory is 1-2 business days before the transfer is initiated to your chosen FFL dealer. Final delivery time depends on your FFL's processing speed, but ground shipping typically adds 3-7 business days transit.
- Can I return it if it doesn't function properly?
- Yes, Ironclad Armory accepts returns on new, unfired firearms within 30 days if a legitimate manufacturing defect is found, as verified by our armorers. The firearm must be returned to us, not to Kel-Tec directly, for evaluation. We cannot accept returns on firearms that have been fired, altered, or damaged by the customer.
- Does this work with a standard .308 suppressor?
- Yes, the RFB18's adjustable gas system is designed to support suppressor use. You will need a .30-caliber suppressor with a standard 5/8x24 thread pitch (matching the rifle's muzzle threads) and should start with the gas regulator on the lowest setting, increasing as needed for reliable cycling, which typically takes about 10-15 rounds of adjustment.