Kel-Tec RDB-17 5.56 NATO Bullpup Semi-Auto Rifle, 17.3 in Nitrided Barrel, Adjustable Gas, Downward Ejection, Aluminum MLOK Handguard, 30+1
This Kel-Tec RDB-17 stands out with its compact bullpup layout, downward-ejecting design, and a clean, custom setup featuring an Aluminum MLOK handguard and a three-prong flash hider. It uses a short-stroke gas piston with an adjustable regulator, includes a T-marked Picatinny rail section on the handguard while the receiver top is smooth/unrailed, and accepts standard STANAG/AR-pattern magazines. The rifle remains light and handy at approximately 27.3 inches overall length and about 6.7–6.9 pounds.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in great shape. There are some minor and superficial scratches and blemishes present.
What’s Included
- No case included
- 1x 30-round translucent polymer AR-pattern magazine
- Aluminum M-LOK handguard (installed)
- Three-prong flash hider (installed)
The RDB-17 employs a semi-automatic, short-stroke gas piston system with a rotating bolt, paired with a downward-ejecting layout. This configuration keeps ejection away from the shooter and supports ambidextrous use. An adjustable gas regulator lets the user fine-tune operation for different loads and conditions.
The 17.3-inch nitrided steel barrel is threaded and fitted with a three-prong flash hider. The action is fed via standard STANAG/AR-pattern magazines, and capacity is 30+1. A left-side charging handle and a manual safety round out the core controls.
Furniture includes a durable polymer frame and stock with an integrated rear sling loop and a rubber buttpad. Length of pull is approximately 14.5 inches. The rifle features a custom Aluminum M-LOK handguard installed, adding modern accessory mounting on a rigid aluminum interface.
A T-marked Picatinny rail section on the handguard provides forward mounting space; the receiver top is smooth/unrailed, so there is no continuous top rail. Overall length is approximately 27.3 inches, with an overall weight around 6.7–6.9 pounds, offering a compact bullpup profile made in the USA.