Kel-Tec Sub2000MK2 Upgrades

Review and photographs by Oleg Volk

The story of this carbine goes back to 1997, when Kel-Tec introduced the Sub-9 carbine. In general, it was a conventional blow-back gun with the magazine inserted through the hand grip. Designed during the high-capacity-magazine-ban years, it used popular and available pistol magazines, but the Sub-9’s claim to fame was its unusual folding form.

When folding or collapsible stocks were not legal, the Sub-9 worked around that concept by creating a carbine that folded in half at the chamber, halving its overall length for storage and transport.



The folding is initiated by pulling down on the back of the trigger guard, which allows the front of the gun to swing up and back eventually locking the front sight into a recess on the butt-stock.

In 2001, the machined aluminum receiver was replaced with a plastic clamshell, resulting in a lighter and less expensive Sub-2000 model, and since it was made to fit several makes of pistol magazines, in 9mm Luger and .40S&W, this carbine became extremely popular.

Kel-Tec Sub-2000Mk2 (Mark 2). An upgraded version of the Sub-2000 but very similar mechanically and incorporates many improvements that were requested by users but often supplied by after-market accessory makers.

Features and Upgrades

Performance has improved. Racking the bolt is easier, although the two-finger extended charging handle from Twisted Industries would still be a useful addition. The barrel appears to have improved as well. The old Sub-2000 ranged from 5 to 6 minute of angle while the new one shoots 2.6 to 4 MOA with the same red-dot sight. The top rail even allows the use of magnified optics, since the carbine itself is accurate enough to justify them. Cantilevered AR-15 scope mounts should be used because the top rail only covers the front two-thirds of the forend.

The gun ran reliably with all types of ammunition, except 50- to 60-grain hyper velocity loads. Point of impact changed considerably from load to load and as much as 3 inches diagonally at 25 yards. For serious use, it’s best to find one load that shoots well and stick to it.

Overall, the gun favors lighter-weight ammunition. The absolute winner in the accuracy department is the all-copper 100-grain OATH Halo with a consistent 2.6 MOA. A mild load with 1,250 feet-per-second velocity also produces minimal recoil and expands reliably.

One hundred and fifteen-grain Corbon JHP and, surprisingly, Winchester’s “white box” FMJ are almost as good with 3 MOA. Remington Golden Saber 124-grain is less accurate with 4 MOA, but works well up close with 1,350 fps velocity. Winchester 147-grain JHP lagged at 4.5 MOA, but would be accurate enough for its intended short-range use with sound suppressors.

Although 60-grain Liberty ammunition did not cycle, it did reach 2,550 fps and could be used for varmints out to nearly 100 yards.

The trigger pull is about 6.5 pounds and not very smooth, with a gritty second stage and some over-travel. Fortunately, the wide trigger guard allows for a safe addition of a trigger shoe designed for a P11 pistol. This wide shoe improves the feel of the trigger and gives it better control. This carbine uses an internal hammer with a sufficiently energetic pin-strike which makes misfires unlikely. In fact, I’ve had no malfunctions of any kind, even with over 300 rounds of mixed-type ammunition.

The bolt does not stay back on the last shot, but the difference in the feel is sufficient to tell when the gun is empty, and the charging handle can be locked back to show a clear chamber. This carbine fits 17- or 33-round Glock magazines and works well with 50- and 100-round drums; all drop freely when released. Smith & Wesson M&P magazines are the next in line for production after the Glock-compatible model.

In practical terms, it’s a competent companion to a center-fire pistol. Its main advantage over the pistol is improved practical accuracy and some increase in muzzle velocity. Folded, it can safely fit into a laptop case with a loaded magazine in the grip. While ballistically weaker than a true rifle, the Sub2000Mk2 is also lighter and quieter. For firing indoors, the reduction in concussion is very helpful, not to mention many ranges do not permit 5.56mm and other rifle calibers. –AmSJ

Note: Some of the photos for this article show a pre-production version of the Sub2000mk2 carbine without the threaded muzzle. All production guns will have a threaded muzzle.