Connecticut FirearmsCatalogue entry
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Kel-Tec RDB Defender Bullpup 5.56 NATO Green Rifle

The Kel-Tec RDB Defender is a compact bullpup rifle chambered in 5.56 NATO and .223 Remington. Its rear-mounted action and 16.1-inch barrel provide a full-length rifle barrel in a compact 26.1-inch overall package. The gas-operated semi-automatic design feeds from AR-15 pattern magazines and accepts a 20-round magazine for a 20+1 capacity. A green finish, M-LOK forend, optics-compatible top rail, folding sights, and threaded muzzle support a flexible setup for range use, training, and practical rifle applications.

Key features

  • Bullpup configuration delivers a full-length 16.1-inch barrel in a compact 26.1-inch overall length.
  • Chambered in 5.56 NATO and .223 Remington for broad ammunition compatibility.
  • Gas-operated semi-automatic action provides fast follow-up shots.
  • 20+1 capacity uses widely available AR-15 pattern magazines.
  • M-LOK forend supports compatible lights, grips, and other accessories.
  • Optics-compatible top rail allows red dots or other aiming systems to be added easily через a standard mounting system.

The Kel-Tec RDB Defender combines compact bullpup handling with familiar AR-15 magazine compatibility and adaptable accessory mounting.

Kel-Tec RDB Defender Bullpup 5.56 NATO Green Rifle: quick facts

What caliber is the Kel-Tec RDB Defender Bullpup 5.56 NATO Green Rifle?
It is chambered in 5.56 NATO, .223 Remington.
How many rounds does it hold?
20+1 rounds.
How big and heavy is it?
Barrel length 16.1 inches, overall length 26.1 inches, weight 5.25 pounds.
What kind of action does it use?
Semi-Automatic.
Is it optic ready or threaded?
Optic ready: Yes; threaded barrel: Yes.
What sights and finish does it have?
Sights: Standard Sights; finish: Green.
Is it new or used?
New, in the original packaging.
Can I buy it in Connecticut?
Yes. It ships to a licensed FFL dealer in Connecticut; you pick it up there after the background check. Connecticut buyers need a Long Gun Eligibility Certificate or pistol permit, and the Connecticut dealer will only transfer rifles and shotguns that are legal under the state's assault weapon law.
Is it in stock?
Yes, at $962.54. Orders leave within 1-2 business days; shipping is free over $999.

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