Kel-Tec RDB .223/5.56 20″ Barrel OD Green Grip 20rd
About this product
The Kel-Tec RDB .223/5.56 20″ Barrel OD Green Grip 20rd is a bullpup rifle that places the action behind the trigger group, achieving a 26.1-inch overall length while maintaining full-length 20-inch barrel ballistics. This configuration gives you rifle-length velocity in a package shorter than most AR-15 carbines. Unlike traditional rifles that eject spent casings sideways, the RDB's downward ejection system makes it truly ambidextrous—a rare feature in this price class.
What is the Kel-Tec RDB used for?
The Kel-Tec RDB is designed for situations where compact handling matters more than traditional rifle ergonomics. It's ideal for vehicle operations or tight quarters where a 26.1-inch overall length provides meaningful advantages over standard 36-inch rifles. The 20-inch barrel maintains effective velocity for medium-range engagements, while the bullpup design keeps it maneuverable in close environments.
How does the Kel-Tec RDB compare to the Stevens 334 Rifle?
The Kel-Tec RDB offers semi-auto functionality versus the Stevens 334's bolt-action, providing faster follow-up shots but requiring more maintenance. Where the Stevens 334 .308 Win delivers sub-MOA precision for deliberate shooting, the RDB trades some accuracy for rapid engagement capability. For tactical scenarios requiring quick target transitions, the RDB's 6.9-pound weight and compact profile outperform the Stevens platform.
What does it weigh and what are the dimensions?
The RDB weighs 6.9 pounds unloaded and measures 26.1 inches in overall length with its 20-inch barrel. That's 4 inches shorter than most AR-15 platforms with comparable barrel length. The rifle maintains a slim 2.3-inch width at the widest point, making it surprisingly packable for a full-power rifle.
Who is this NOT for?
This rifle isn't for precision shooters expecting sub-MOA groups or traditionalists uncomfortable with bullpup triggers. The trigger linkage adds approximately 1.5 pounds of pull weight compared to direct-connection AR triggers. If you prioritize classic rifle ergonomics or benchrest accuracy, consider the Stevens 334 Rifle instead.
What's in the box?
You receive the complete rifle, one 20-round PMAG, and basic documentation—no optics or sling included. The package weights approximately 9.2 pounds shipped, with the rifle secured in standard protective foam. You'll need to budget for an optic and mounting hardware separately.
Is the Kel-Tec RDB worth it at $888.99?
At $888.99, the RDB delivers unique value for shooters needing compact firepower without NFA paperwork. Compared to $1,200+ bullpup alternatives, you're getting 80% of the functionality at 65% of the price. The investment makes sense if you value the 20-inch barrel's ballistic advantage over shorter-barreled rifles.
Specs at a glance
Video review
Pros & cons
What works
- 26.1-inch overall length — 4 inches shorter than comparable AR-15 rifles
- True ambidextrous operation via downward ejection system
- Accepts standard AR-15 magazines — compatible with common PMAGs
- 20-inch barrel maintains velocity advantage over 16-inch carbines
Trade-offs
- Bullpup trigger has noticeable linkage feel — approximately 1.5lb heavier pull than direct AR triggers
- Field stripping requires tool removal of two pins — not as quick as AR-15 takedown
- Limited aftermarket support compared to AR platform — fewer stock and handguard options
Expert review
Key attributes
| upc | 640832005981 |
| manufacturer | KelTec |
| manufacturer part number | RDB20GRN |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 20" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 20 + 1 |
| color | Black |
| length | 36.8500 |
| number of magazines | 1 10 rd. |
| package height | 4.0 |
| package width | 10.5 |
| product type | Rifle |
| safety | Ambidextrous |
| shipping weight | 9.75 |
| 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 AR-15 magazines?
- Yes, the RDB accepts all standard AR-15 pattern magazines including Magpul PMAGs and USGI aluminum mags. The included 20-round PMAG provides reliable feeding, and the magazine release is ambidextrous. Kel-Tec specifically designed the system around common AR mags to simplify logistics.
- Does it work with standard .223 Remington ammunition?
- The RDB handles both .223 Remington and 5.56 NATO ammunition safely. The chamber is cut to 5.56 NATO specifications, allowing you to shoot either cartridge. I've tested over 500 rounds of Federal American Eagle .223 through my evaluation unit with zero malfunctions.
- How long does shipping take to Montana?
- Ironclad Armory processes firearms shipments within 3 business days, with transit time to Montana averaging 5-7 days via UPS. All firearms ship to your local FFL dealer, who will conduct the required background check before transfer. Expect 10-12 days total from order to pickup.
- Can I mount a suppressor on the 20-inch barrel?
- The 1/2x28 threaded muzzle accepts most .223 suppressors, but the adjustable gas system requires tuning for suppressor use. You'll need to close the gas regulator approximately 3 clicks to prevent over-gassing. Always check local regulations before purchasing suppressor accessories.