The KRISS Vector SBR Gen 3 9mm in Alpine White puts the third-generation Vector in its shortest rifle form, chambered in 9x19mm with a 5.5-inch barrel and a Alpine White finish (KRISS part no. KV90-3SAP00). Its Super V recoil system and very low bore axis work together, turning the energy that usually lifts the muzzle into a counterweight that keeps follow-up shots quick. The Gen 3 upper accepts aftermarket pistol grips, and the refreshed lower housing improves ergonomics and hand support. Full-size Glock magazines fit, one 40-round magazine comes in the box, and the threaded barrel is ready for a muzzle device or a suppressor. At 6.4 pounds and just over two feet long with the stock collapsed, it is about as small as a rifle-format pistol-caliber carbine gets.

Key Specifications

• The chambering is 9x19mm, the most common pistol cartridge in the country.
• Barrel length is 5.5 inches (139.7 mm), short enough to keep the whole rifle handy indoors.
• The barrel is 4140 chrome moly steel, a tough alloy for long service life.
• Barrel finish is black nitride (QPQ), a hard surface treatment that resists wear and corrosion.
• The muzzle is threaded 1/2×28 RH, ready for a compatible muzzle device or suppressor.
• It ships with one 40-round magazine and takes full-size Glock magazines.
• The stock is the KRISS ambidextrous telescopic folding stock, which adjusts for length and folds for storage.
• Overall length is 24.25 inches collapsed and 26.2 inches extended, very compact for a shoulder-fired rifle.
• Weight is 6.4 pounds unloaded, light enough to carry and shoulder all day.
• The rifle wears a Alpine white finish, a light color that stands apart from black rifles.

Frequently Asked Questions

Is the Alpine White version mechanically the same as the black one? Yes. KRISS lists the same barrel, stock, trigger and operating system for every Gen 3 SBR color; only the finish changes.

What comes in the box? KRISS ships the rifle with one magazine, a cleaning kit, a cable lock, a user manual and a warranty card.

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.

Buy the KRISS Vector SBR Gen 3 9mm 5.5-Inch, Alpine White

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 semi-auto rifles lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.