Kel-Tec SUB-SDP
The Kel-Tec SUB-SDP, nicknamed the “Nub Sub,” is the first pistol version of Kel-Tec’s folding Sub-2000 platform — a 9mm braced pistol that collapses from 17.7 inches to just 10 inches for storage or transport. It uses the same Glock-pattern magazines and threaded 6-inch barrel as the Sub-2000, with an integrated pistol brace and M-LOK rail for accessories. Available in a base Standard configuration or a Defender package with a red dot, compensator, and extended magazines already installed.
Read our full Kel-Tec SUB-SDP Buying Guide ↓
What Is the Kel-Tec SUB-SDP?
The SUB-SDP takes Kel-Tec’s two-decade-old Sub-2000 folding carbine platform and reworks it as a pistol — no shoulder stock, just an integrated pistol brace, which keeps the gun classified as a handgun rather than a short-barreled rifle. Folded, it measures just 10 inches long; unfolded with the brace extended, it's 17.7 inches — small enough to store in a backpack, glove box, or bag, and quick to deploy when needed.
SUB-SDP Standard: Specs and Features
The Standard SUB-SDP ships with a 6-inch barrel threaded 1/2x28 for suppressors and compensators, a 15-round Glock-pattern magazine, and an M-LOK slot for lights or other accessories. Unloaded weight is 3.57 lbs — light enough to carry all day, heavy enough to stay controllable at 9mm recoil levels. MSRP is $599.
SUB-SDP Defender: The Loaded Package
The Defender configuration takes the same folding pistol and adds a Vortex Crossfire red dot, a compensator, an M-LOK-mounted spare magazine holder, and two 27-round Magpul PMAGs — extended Glock-pattern magazines that bring the gun to a genuinely useful capacity for a home-defense or truck-gun role. MSRP is $799, and unloaded weight with the included accessories rises to 4.21 lbs.
Glock-Pattern Magazine Compatibility
Like the Sub-2000 it's based on, the SUB-SDP runs standard Glock-pattern 9mm magazines — from factory 15-round Glock 17 magazines up through extended 27-round Magpul PMAGs. That means SUB-SDP owners who already run Glock pistols can share magazines between the two, and aftermarket Glock-pattern magazine options are widely available.
Who the SUB-SDP Is For
The SUB-SDP is built for buyers who want more capability than a standard carry pistol without the size of a rifle — a truck gun, a bag gun, or a home-defense pistol that folds small enough to store out of sight but deploys to a stable, braced platform in seconds. The threaded barrel and M-LOK rail mean it's ready for a suppressor, light, or optic without any additional gunsmithing.
Frequently Asked Questions
Is the Kel-Tec SUB-SDP a pistol or a rifle?
A pistol. It uses an integrated pistol brace rather than a shoulder stock, which keeps it classified as a handgun rather than a short-barreled rifle under the NFA.
What magazines does the SUB-SDP use?
Glock-pattern 9mm magazines — the same magazines used by the Kel-Tec Sub-2000 and compatible Glock pistols.
What's the difference between the SUB-SDP Standard and Defender?
The Standard ships with a 15-round magazine and no optic. The Defender adds a Vortex Crossfire red dot, a compensator, an M-LOK magazine holder, and two 27-round Magpul PMAGs.
Can I put a suppressor on the SUB-SDP?
Yes — the 6-inch barrel is threaded 1/2x28, a common thread pitch for 9mm suppressors and compensators.
Browse our full 9mm Pistols selection and see the Kel-Tec Sub-2000 carbine this pistol is based on.