Kel-Tec RDB for sale
(2)
KEL-TEC RDB-20
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
20.5in
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20
Finish Per Color:
Black
(18)
Kel-Tec RDB 5.56 17.4" Rifle, Black
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
17.3
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20
Finish Per Color:
Black
(3)
KEL-TEC RDB
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Black
(0)
Kel-Tec RDB-S .223/5.56, Bullpup, 16.1" Barrel, Collapsible Stock, Black, 10rd
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20+1
Finish Per Color:
Black
(0)
Kel-Tec RDB-S 5.56/.223, 16.1" Barrel, OD Green, Collapsible Stock, 10rd
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20+1
Finish Per Color:
Green
(0)
Kel-Tec RDB 20" 5.56x45mm Bullpup Rifle, FDE - RDB20TAN
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
20in
Caliber:
5.56×45mm NATO
Capacity:
10
Finish Per Color:
Tan
(1)
Kel-Tec RDB-C .223Rem 5.56x45mm
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
20.5in
Caliber:
.223 Rem
Capacity:
10
Finish Per Color:
Black
(0)
Kel-tec Rdb, Kel Rdbdgrn 223 16in Defender Green
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16
Caliber:
.223 Rem
Capacity:
20+1
Finish Per Color:
Od Green
(1)
KEL-TEC RDB
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
20in
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20
Finish Per Color:
OD Green
(0)
KELTEC RDB
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
17
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
20
Finish Per Color:
Tan
(0)
Kel-Tec RDB Defender 5.56 16" 20 Rounds Tan
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Tan
(4)
Kel Tec RDB 5.56 Nato 17" Bullpup Rifle, OD Green - RDBGRN
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
17in
Caliber:
5.56×45mm NATO
Capacity:
20
Rounds:
20
(1)
Kel-Tec RDB-C 5.56MM 20-inches 10Rds
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
20.5in
Caliber:
5.56×45mm NATO
Capacity:
10
Finish Per Color:
OD Green
(0)
Kel-tec Rdb Defender 5.56mm - 16.1" 20rd M-lok Tan
Brand:
Kel-tec
Action:
Semi-Auto
Barrel Length:
16.10"
Caliber:
5.56×45mm NATO
Capacity:
20
Marketplace Insights
★ 4.6/5
based on 30 customer reviews across 14 variants from 29 retailers
Highly praised bullpup rifle praised for compact size, excellent trigger, and reliable operation, with minor learning curve on ergonomics and gas adjustment.
What customers like
Compact Size43%
it's just about the same length as a 10.5" ar pistol, with the accuracy of a 20" barrel
Excellent Trigger23%
Trigger is outstanding for a bullpup. Probably better that Steyr, Tavor etc.
Reliable Cycling23%
Ran like a charm, used Wolf Steel and Federal Brass, 20 round, 30 round, and PMAG drums
Ambi Downward Ejection20%
This one has a rather ingenious downward ejection which makes it truly ambi.
Fun to Shoot20%
This is a smooth shooting, very short, accurate little rifle. It is a lot of fun!
Common concerns
Gas Adjustment Learning Curve17%
You could tell it wasnt tested before being sold because I had to adjust the gasblock
Plastic Construction Quality10%
For the price it seems like there would be a lot less of plastic.
Non-Standard Manual of Arms10%
Manual of arms is very different, not bad, just different if you are a heavy AR user
Hot Brass When Prone7%
The problem comes in if you are shooting while lying down. I've gotten a few burns
Frequently Asked Questions
Kel-Tec RDB for sale
Is the KelTec RDB any good?
The RDB is a compact 5.56 NATO bullpup with a smooth trigger, accessible gas system, and intuitive controls. Despite basic plastic construction, it's durable and reliable. At around $840, it offers solid value for home defense or range use, though bullpup ergonomics won't suit every shooter.
What are the common problems with the KelTec RDB?
Common issues include gas system tuning sensitivity—too little causes failures to eject, too much batters the buffer. The bolt release requires pressing both sides simultaneously and can feel stiff. The trigger is mediocre, ergonomics feel dated, and aftermarket support remains limited compared to competing rifles.
How does the KelTec RDB compare to AR-15s?
The RDB is a bullpup with piston-driven operation and downward ejection, making it ambidextrous and more compact than AR-15s. AR-15s have vastly superior aftermarket support, better ergonomics, and generally higher accuracy potential. The RDB runs cooler and softer but costs more per equivalent capability.
How much is a used KelTec RDB worth?
Used RDB rifles typically sell for $350 to $650 depending on condition and round count. New models average around $769, with a 12-month average near $748. Actual value depends on wear, functionality, and local demand.
What is the difference between the RDB and the RDB defender?
The RDB Defender combines features from the standard RDB and RDB Survival models, coming standard with a 16-inch thin to medium contour barrel, aluminum M-LOK handguard, and collapsible stock for lighter weight and tactical versatility. Standard RDB models offer different barrel lengths and configurations. Both share the same adjustable gas piston system.
What does RDB stand for in KelTec?
RDB stands for Rifle, Downward-Ejecting, Bullpup. Kel-Tec's design ejects spent casings downward rather than to the side, making it fully ambidextrous and eliminating the typical bullpup problem of hot brass hitting your face. The number following RDB indicates barrel length, like 17 for the 17-inch variant.
What is the best scope for the Kel Tec RDB?
Scope choice depends on your use. Red dots like the Trijicon MRO or Holosun HS503CU work well for close-range shooting. For longer distances, consider a 1-4x or 1-6x variable scope. Prism scopes like the Vortex Spitfire 1x offer speed and precision with an etched reticle that functions without batteries.
What makes the Kel Tec RDB unique?
The RDB is a bullpup rifle chambered in 5.56 NATO featuring patented downward brass ejection, making it fully ambidextrous without redirecting hot casings toward the shooter. It uses a short-stroke gas piston with an adjustable regulator and offers a compact overall length despite a full-length barrel.
Does the Kel Tec RDB take AR mags?
Yes, the Kel-Tec RDB accepts standard AR-15/M16 magazines. It is chambered in 5.56 NATO and uses a standard AR-pattern magazine well, located behind the pistol grip due to its bullpup layout.
Is the Kel-Tec RDB good for home defense?
The RDB fires 5.56 NATO and handles recoil well, but it requires gas regulator tuning and has mixed reliability feedback. It appeals to home defense users and hunters, not just range shooters, though reliability concerns give some buyers pause. It retails around $841.