The HK VP9A1 K is a compact-frame 9mm pistol with a 4.09-inch black barrel and a serrated optic-ready slide. It ships with a Vortex CCW optic and two 10-round magazines. The frame includes a Picatinny rail and interchangeable backstrap grips. 
 

Key Specifications 

• Brand: HK 
• Model: VP9A1 K 
• Caliber: 9mm 
• Action: Semi Auto 
• Barrel Length: 4.09 inches 
• Capacity: 10 rounds (2 magazines included) 
• Color/Finish: Black 
   

Detailed Features 

• Ships with Vortex CCW optic included 
• Compact frame with optic-ready serrated slide 
• Black polymer frame with Picatinny rail 
• Interchangeable backstrap grips 
• Two 10-round magazines included

Owners of the HK VP9A1 K often choose it for its compact frame paired with a factory-included optic. The Vortex CCW is a reasonable starting point, and the optic slide cut means owners can swap to a different footprint without gunsmithing.

The compact frame with interchangeable backstraps gets consistent positive feedback from shooters across hand sizes. The 10-round capacity is the standard complaint, particularly in jurisdictions where higher-capacity options are available but the included magazines cap it.

Build quality commentary echoes the broader VP9 line: solid polymer frame, reliable striker action, and good out-of-box accuracy. The Picatinny rail adds flexibility for light mounting. A few owners note the price, inclusive of the optic, is higher than some competitors but point to HK's quality control as the justification.