RDB stands for Rifle Downward-ejecting Bullpup and the 17 points to the barrel length. This variant is the original and features a high-impact resistant Zytel forend with built-in Picatinny-style rail on the bottom for mounting accessories. Like all the RDB variants it’s completely ambidextrous accurate and compact.

Specifications:

CALIBER: .223Rem
WEIGHT UNLOADED: 7.1lbs
MAGAZINE CAPACITY: 20 or any AR15 Magazine
OVERALL LENGTH: 30.6"
BARREL LENGTH: 20"
TWIST RATE: 1:7?
TRIGGER PULL: 4lbs

Additional information

UPC	640832005998
Manufacturer	KelTec
Manufacturer Part Number	RDB20TAN
Action	Semi-Auto
ATF Type	MODERN SPORTING RIFLE
Sights	No
Caliber/Gauge	.223 REM/5.56 NATO
Length	37.2000
Capacity	20
Color	Black
State Restriction (CA)	NO DIRECT SHIP TO CALIFORNIA
State Restriction (RI)	NO DIRECT SHIP TO RHODE ISLAND
State Restriction (WA)	NO DIRECT SHIP TO WASHINGTON
State Restriction (IL)	NO SALE TO ILLINOIS PICA
State Restriction (OR)	NO SALE TO OREGON
Rate of Twist	1:7"
Barrel Length	20
Safety	Ambidextrous
Product Type	Rifle
Shipping Weight	9.8
Package Width	10.5
Package Height	4.0
Number of Magazines	1 20 rd.