The KRISS Vector SBR Gen 2 9mm in Black is the smallest rifle-format Vector of the second generation, a 9x19mm short-barreled rifle with a 5.5-inch threaded barrel (KRISS part no. KV90-SBL20). KRISS’s patented Super V system redirects blowback energy downward, and the barrel sits below the fire control group for what KRISS calls the lowest bore axis of any firearm in the world. Like every Vector, it feeds from full-size Glock magazines, which lets it share ammunition and magazines with a Glock sidearm. KRISS ships it with one 40-round magazine, a 2-stage quick-reset trigger and low-profile flip sights, so it is ready for the range, home defense or a suppressor.

Key Specifications

• The chambering is 9x19mm, the most common pistol cartridge in the country.
• Barrel length is 5.5 inches, and the barrel is threaded for a muzzle device or suppressor.
• Overall length is 24.00 inches collapsed and 27.25 inches extended, very short for a shoulder-fired rifle.
• Weight is 7.0 pounds, enough mass to help settle a short barrel.
• The barrel is 4140 chrome moly steel, a durable barrel alloy.
• Barrel finish is black nitride (QPQ), a hard treatment that resists wear and corrosion.
• The twist rate is 1:10 right-hand, a rate KRISS uses across the Vector SBR calibers.
• It ships with one 40-round magazine and accepts full-size Glock magazines.
• The trigger is a 2-stage, quick-reset unit that supports fast follow-up shots.
• The stock is a 6-position collapsible design, so length of pull adjusts to the shooter and gear.

Frequently Asked Questions

How is the Gen 2 different from the Gen 3? The Gen 2 SBR uses a 2-stage, quick-reset trigger and a 6-position collapsible stock, and KRISS lists it at 7.0 pounds with a 5.5-inch barrel.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for short-barreled rifles. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply. Taking an SBR across state lines still requires an approved ATF Form 5320.20.

What magazines does this 9mm Vector SBR take? Full-size Glock magazines in 9mm. KRISS includes one 40-round magazine with the rifle.

Buy the KRISS Vector SBR Gen 2 9mm 5.5-Inch, Black

As of October 9, 2026, this short-barreled rifle transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through KRISS‘s short-barreled rifles lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.