The KelTec RDB Defender black bullpup rifle in 5.56mm (KelTec part no. RDBDBLK) is the RDB set up with an M-LOK rail so you can mount the light, grip and accessories your setup calls for. It pairs an aluminum M-LOK handguard and a collapsible stock with a 16-inch pencil profile barrel, and it is built for light-duty tactical use and property defense. The bullpup layout puts the action behind the grip, which delivers a full barrel in a rifle far shorter overall than a standard rifle. Three 20-round magazines come with it, and the magwell accepts any AR-15 magazine beyond that.

Key Specifications

• Chambered in 5.56mm, the caliber the maker lists for the RDB Defender.
• The barrel is a 16-inch pencil profile barrel, a full-length barrel in a short bullpup package.
• Capacity is 20 rounds per magazine, and the rifle ships with three magazines for 60 rounds on hand.
• The magwell takes any AR-15 magazine, so extra capacity is easy to add.
• An aluminum M-LOK handguard runs the length of the forend, so a vertical foregrip, light or other accessory mounts where you want it.
• A collapsible stock adjusts the rifle to different shooters and gear.
• A full-length Picatinny rail on top gives room for an optic, red dot or backup sights, with space to set eye relief.
• Spent casings eject downward, so the rifle shoots the same from either shoulder with no brass in your face.
• The controls are fully ambidextrous, which suits left-handed and right-handed shooters alike.
• The color is black, as the maker lists it for this part number.

Frequently Asked Questions

How many magazines come with the RDB Defender? The maker lists three magazines of 20 rounds each, which is 60 rounds on hand out of the box, and the magwell takes any AR-15 magazine beyond that.

What is the M-LOK handguard for? M-LOK slots run the length of the aluminum handguard, so a vertical foregrip, light or other accessory can mount where you want it rather than where a single bottom rail allows.

Is the RDB Defender ambidextrous? Yes. The controls are ambidextrous and spent casings eject downward through the stock, so it runs the same for a left-handed shooter as a right-handed one.

Buy the KelTec RDB Defender Bullpup Rifle, 5.56mm, 16-Inch Barrel, M-LOK, Black, 20-Round

A bullpup that moves easily through doorways, vehicles and tight spaces while keeping a full barrel is the idea behind the Defender. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more semi-auto rifles here.