The Walther WMP is a semi-automatic pistol chambered in .22 WMR, with a 4.5" barrel, 15+1 capacity, and an OD green polymer frame paired with a matte black slide. At 27.8 oz, it runs heavier than most .22 LR pistols, which is the trade-off for the added power of the magnum rimfire cartridge. 
 

Key Specifications 

• Manufacturer: Walther Arms 
• Model: WMP 
• Caliber: .22 WMR (Magnum) 
• Action Type: Semi-Automatic 
• Barrel Length: 4.5 inches 
• Overall Length: 8.20 inches 
• Capacity: 15 + 1 rounds 
• Weight: 1.7 lbs (27.8 oz) 
• Finish: OD Green polymer frame with matte black slide 
• Sights: Fiber optic front and serrated fixed rear sights 
   

Detailed Features 

The fiber optic front sight paired with a serrated fixed rear makes target acquisition fast in varied lighting. The textured polymer grip holds well during firing. A 15+1 capacity is generous for the .22 WMR platform. Trigger safety is included. 
 
The .22 WMR cartridge hits harder than standard .22 LR and has practical use for small game and pest control at moderate range, though it costs more per round and ammunition availability can be inconsistent compared to .22 LR. 
 

Usage 

The WMP works well for sport shooting, small game hunting, and general range use. The OD green finish is distinctive. New shooters will find the recoil manageable, and experienced shooters looking for a .22 WMR platform will appreciate the capacity and sight quality.

Owners of the Walther WMP generally have positive things to say, with some recurring practical concerns.

The lightweight design and ergonomic grip come up consistently as strengths. The fiber optic sights get credit for improving visibility. Accuracy at short and medium range is well-regarded, and most owners are satisfied with how it handles.

.22 WMR as a caliber choice draws interest -- it has more energy than .22 LR, which makes it useful for small game and pest control. The downside noted by multiple users is that ammunition is not always easy to find and costs more than .22 LR, which can limit how often people actually shoot it.

On the negative side, some reliability issues with certain ammunition types show up in early use or during break-in periods. A portion of owners would like to see trigger pull improvement. There are also some questions about how the OD green finish holds up over time with regular carry and use.

Overall feedback reflects solid appreciation for the platform's features while acknowledging that .22 WMR supply constraints are a real practical consideration.