The Walther PDP Full Size 4" is a striker-fired semi-automatic pistol chambered in 9mm Luger (9x19 Para). It has an 18+1 round capacity, 4-inch barrel, and ships with a polymer frame and steel slide in black. 
 
Key Specifications: 

• Manufacturer: Walther Arms 
• Model Name: PDP Full Size 4" 
• UPC: 723364218262 
• Caliber: 9MM LUGER (9X19 PARA) 
• Action: Striker Fire 
• Capacity: 18+1 Rounds 
• Barrel Length: 4 inches 
• Overall Length: 7.5 inches 
• Weight: 24.6 oz (1.53 lbs) 
• Finish: Black 
• Frame Material: Polymer 
• Slide Material: Steel 
   
  Detailed Features: 
   

Performance Duty Trigger: 

The trigger has shorter travel and cleaner tactile feedback compared to the previous PDP generation, which tightens shot-to-shot consistency. 
 

SuperTerrain Serrations: 

The raised serrations on the slide provide positive purchase during manipulation, including when hands are wet or gloved. 
 

Performance Duty Texture: 

The grip texture holds well through varied conditions without being abrasive against skin or clothing. 
 

Red Dot Ergonomics: 

The grip angle and sight radius are designed around mounting a red dot. The natural point of aim works particularly well when transitioning between targets. 
 

Optics Ready: 

Every model has a factory optic cut. A cover plate is included for shooters who prefer iron sights.

The Walther PDP 9mm Full-Size Optic Ready Pistol gets a lot of positive attention, with a few consistent talking points.

Ergonomics come up first and most often. The grip texture and geometry accommodate a range of hand sizes, and the 18+1 capacity is frequently noted as one of the better capacities in the full-size class. The trigger earns steady approval for its feel and reset. Optics compatibility is a real draw for buyers who run red dots or plan to.

Build quality is considered good, and the gun runs reliably across different ammunition types according to most owners. Comparisons to Glock and Sig Sauer are frequent, with opinions split along personal preference lines.

Criticism tends to cluster around size and price. The full-size frame makes concealed carry impractical for many, and some shoppers feel the price is high relative to competing options. A portion of users also note that Walther's customer service experiences are inconsistent. Overall the reception is positive.