Kel-Tec RDB Defender Bullpup Rifle - Tan | 5.56NATO | 16" Barrel

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The RDB Defender is the result of taking the RDB and the RDB Survival and mashing them up to forge the perfect 5.56, light-duty, tactical bullpup. It's lightweight, comes standard with an aluminum, M-LOK handguard, collapsable stock and 16" pencil profile barrel. Defend your property, your community and your homeland with the most tactically versatile bullpup on the market with the RDB Defender.


Like no ordinary bullpup, the RDB series of rifles redefines the platform. You’ve never experienced balance or a trigger quite like this in any other design. The RDB is completely ambidextrous due to its patented downward-ejection, magazine catch/release placement, intuitive safety and reversible operating handle. The RDB series of bullpups delivers a 5.56/.223 ballistic advantage in a very compact package that’s easy to manipulate for just about anyone.

Downward Ejection

This unrivaled design sends spent brass downward through the stock, behind the magwell making it a truly ambidextrous bullpup rifle. Gone are the days of hot gas & brass flying out of a side-ejection port… you’re welcome, southpaws.

Unparalleled Trigger System

Bullpup triggers are notoriously bad, so we tackled that issue head on and won. This trigger is incredibly smooth, with a nice take-up and clean break. Combined with a 1:7 twist barrel, all RDB models offer excellent accuracy.

Adjustable Gas System

All of the RDB models operate off of the same adjustable gas piston system. This feature allows the user to tailor the bolt carrier speed to eliminate excessive recoil while running a suppressor and ensure reliability for various loads.

Caliber .223REM/5.56NATO
Weight (Unloaded) 6.7 lbs
Magazine Capacity 20rd
Overall Length 27"
Barrel Length 16.1"
Twist Rate 1:7"
Trigger Pull 4.5-5.5 lbs
More Information
ModelRDB Defender
Action TypeSemi-Auto
Barrel Length16.1"
Barrel Thread Pitch1/2x28
Barrel TypeSteel
Caliber5.56 NATO
Magazine Count1
Sight TypeN/A
Threaded BarrelYes
Twist Rate1:7"
CA LegalNo
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