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Bullpups have always promised big things in a small package, but most of them come with two headaches: brass flying past your face if you shoulder them lefty, and triggers that feel like squeezing a wet sponge. The Kel-Tec RDB tackles both problems head on. RDB stands for Rifle Downward-ejecting Bullpup, and that name tells you the story. Spent cases get pulled rearward over the magazine and dropped straight down through a chute behind the magwell, completely out of your line of sight. Shoot it right handed, left handed, or switch mid-string. It does not care.
The math here is hard to argue with. You get a full 20 inch barrel, the length 5.56 was originally designed around, in a rifle that measures right around 30.6 inches overall and weighs in the low seven pound range. That extra barrel length squeezes real velocity out of the cartridge, which matters if you stretch your shots out or hunt with it. The 1:7 twist stabilizes heavier bullets well, and the muzzle comes threaded 1/2×28 with a flash hider installed, so adding a suppressor or different muzzle device is simple. The adjustable short stroke gas piston is a genuinely useful touch, letting you tune the rifle for suppressed use or dial it in for whatever ammo you feed it.
This version wears OD green polymer furniture over the black chassis, and it looks great without being flashy. The RDB feeds from standard AR-15 pattern magazines, so your existing mag stash works right out of the box. Up top you get a full length Picatinny rail for optics since the rifle ships without sights, plus a rail section on the forend for lights or other accessories. Kel-Tec also put real work into the trigger, and it shows. For a bullpup, the take-up is smooth and the break is clean, which goes a long way toward wringing out the accuracy this platform is capable of. Balanced right over the grip, the RDB handles fast in tight spaces while still shooting like a full size rifle.
Yes, the RDB feeds from standard AR-15 pattern magazines, which is one of its best features. Metal GI mags, PMAGs, and most other common AR magazines run fine in it. If you already own an AR, your existing magazines carry right over.
It is, and that sets it apart from most bullpups. Spent brass ejects straight down through a chute behind the magazine well instead of out the side, so nothing flies past your face when shooting from the left shoulder. The safety and magazine release are ambidextrous as well, and the charging handle is reversible.
No, this rifle ships optics ready with no sights installed. The full length Picatinny rail on top accepts red dots, magnified optics, or flip-up iron sights, so you can set it up however you like. Most owners run a red dot or a low power variable scope on this platform.
Yes, the barrel is threaded 1/2×28, the standard pitch for 5.56 suppressors and muzzle devices. Even better, the adjustable gas piston system lets you turn the gas down when shooting suppressed, which keeps the action running smoothly and reduces excess gas blowback. It makes a solid suppressor host with the ballistic benefit of the full 20 inch barrel.
| UPC | 640832005981 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RDB20GRN |
| Action | |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Length | 20" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 10 + 1 |
| Color | Black |
| Length | 36.8500 |
| Number of Magazines | 1 10 rd. |
| Package Height | 4.0 |
| Package Width | 10.5 |
| Product Type | Rifle |
| Safety | Ambidextrous |
| Shipping Weight | 9.8 |
| Sights | No |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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