Kel-Tec RDB-17 5.56 NATO Bullpup, 16.1 in QPQ-Nitrided Threaded Barrel, Adjustable Gas, Downward Ejection - Excellent
This Kel-Tec RDB-17 stands out as a compact, USA-made bullpup in excellent condition with a bright, clean bore. It features a short-stroke gas piston system with an adjustable gas regulator and downward ejection, plus a 16.1 in 4140 steel barrel that is QPQ-nitrided and threaded with an A2-style flash hider. Picatinny rail for optics, ambidextrous safety, reversible non-reciprocating folding charging handle, and included custom metal M-LOK handguard with installed vertical foregrip round out a configuration that is practical and well-equipped.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from prior handling and use. Please refer to the photos for a detailed look at the finish and surfaces.
What’s Included
- Kel-Tec factory box (RDB-17 BLACK label)
- Kel-Tec RDB owner's manual
- Black web sling
- Small hardware bag
- Metal M-LOK handguard (installed)
- Polymer vertical foregrip (installed)
- 1x 20rd Magpul PMAG Gen M3 5.56x45 polymer magazine
The RDB-17 is a downward-ejecting bullpup chambered in 5.56mm NATO, using a semi-automatic, short-stroke gas piston system with a rotating bolt. It accepts AR-15/STANAG magazines and ships here with a 20-round Magpul PMAG, providing a 20+1 capacity.
The 16.1 in barrel is made from 4140 steel, treated with a QPQ nitride finish, and threaded for muzzle devices. An A2-style flash hider is installed. The 1:7 twist supports common 5.56 loads effectively.
Controls and interfaces are designed for versatility: a two-position ambidextrous safety, a non-reciprocating folding charging handle on the left side that is reversible, and provisions for mounting optics via Picatinny rail. The rifle wears a black finish throughout.
This example includes a metal M-LOK-style handguard and an installed polymer vertical foregrip, adding modular mounting slots and a stable forward hold. The adjustable gas regulator supports tuning for various ammunition or conditions.
Made in the USA, this RDB-17 arrives with its factory box labeled "RDB-17 BLACK," the owner's manual, a black web sling, and a small hardware bag, complementing its clean overall presentation.