The Kriss Vector Gen II SDP is a semi-automatic pistol chambered in .45 ACP, built around a closed bolt, delayed blowback operating system that redirects bolt mass downward on firing. This mechanism reduces muzzle rise and felt recoil compared to a conventional blowback design, which makes rapid follow-up shots more manageable. 
 

Key Specifications 

• Brand: Kriss USA 
• Model: Vector Gen II SDP 
• Caliber: .45 ACP 
• Action: Semi-Auto 
• Capacity: 13+1 rounds 
• Barrel Length: 5.5 inches 
• Overall Length: 16.75 inches 
• Weight: 5.90 lbs 
• Safety: Ambidextrous 
• Sights: Flip Up Front & Rear 
• Finish: Black Nitride 
   

Detailed Features 

 
The closed bolt design seats the round fully before the firing pin drops, contributing to consistent ignition. The ambidextrous safety works for left- and right-handed shooters without modification. Flip-up front and rear sights give a usable iron sight picture while leaving the top rail open for an optic. 
 
The barrel is 4140 Chrome Moly steel with a black nitride finish. The receiver is polymer. At 5.90 lbs and 16.75 inches overall, this is a large pistol, closer in size to a short-barreled carbine than a conventional handgun. 
 

Usage Scenarios 

• Home Defense: High capacity and moderate recoil under rapid fire make it practical in this role. 
• Sport Shooting: The delayed blowback system and 5.5-inch barrel suit competition formats that allow this platform. 
• Tactical Training: The unusual operating system rewards practice in understanding its manual of arms.

The Kriss Vector Gen II SDP draws strong opinions from .45 ACP shooters. The delayed blowback operating system is the main talking point: most users agree that muzzle rise during rapid fire is noticeably lower than a comparable straight-blowback or locked-breech design, which makes strings of shots feel controlled. Accuracy feedback is generally positive across varying distances.

Ergonomics get mixed reviews. The folding brace geometry and grip angle suit some shooters well and feel awkward to others. The adjustable stock and grip options for the Vector platform are frequently mentioned as a reason to buy, since users can configure the pistol to fit their preferences.

The .45 ACP caliber is appreciated for its terminal performance, though some shooters mention that the Vector's size makes it a niche choice compared to a compact carry pistol in the same cartridge.

Price is a regular topic. The Vector sits at a premium compared to many .45 ACP pistols, and debates over whether the unique operating system justifies the cost are common. Most long-term owners feel it does; buyers who primarily wanted a standard .45 ACP duty pistol tend to find it over-engineered for that purpose.

Customization options and the wide accessory ecosystem are consistently cited as positives. Availability varies by region, which frustrates some potential buyers.