Kel-Tec RDB17 5.56mm NATO Bullpup Rifle with M-LOK Handguard & Three-Prong Flash Hider
The Kel-Tec RDB17 is a compact, downward-ejecting bullpup built for true ambidextrous use. This example retains the proven 17.3-inch barrel and four-position adjustable gas system, but adds a free-float aluminum M-LOK handguard and a three-prong flash hider, giving the shooter expanded accessory space and improved muzzle control while keeping overall length to just 27.3 inches.
Condition
Overall Condition: Good – shows some signs of prior use and handling.
Bore Condition: Good – clean, well-maintained, minor wear marks.
Rifling: Good – intact, well-defined lands and grooves.
Specific Condition Notes: Light external wear and mild carbon residue are present, consistent with normal firing and maintenance.
What’s Included
- Kel-Tec RDB17 5.56mm rifle with installed free-float aluminum M-LOK handguard
- Installed three-prong flash hider (1/2-28 TPI)
- One Magpul PMAG Gen M3 20-round 5.56×45 magazine
The RDB17’s bullpup layout centers the action behind the trigger, yielding a full-length 17.3-inch barrel in a package shorter than most carbines. With the barrel threaded 1/2-28 and topped by a three-prong flash hider, the rifle is ready for further muzzle accessories.
Kel-Tec’s short-stroke gas piston system runs cooler and cleaner than direct impingement designs, and the user can tune the four-position gas block to match ammunition or suppressor use. Spent cases exit straight downward, keeping ejection clear of left- or right-handed shooters.
The aftermarket aluminum M-LOK handguard replaces the factory polymer unit, creating continuous free-float support for the barrel while offering multiple, rigid accessory attachment slots. Combined with the optic-ready top rail and polymer lower, the rifle balances modern modularity with a 6.7-pound weight class.
Ambidextrous safety levers, an ambidextrous folding charging handle, and a 15-inch length of pull make the RDB17 intuitive for shooters of all sizes. Standard AR-15 pattern magazines ensure broad compatibility and easy sourcing of spares.