The Smith & Wesson M&P 22 Magnum is a semi-automatic pistol chambered in .22 WMR with a 4.35-inch barrel, 8.4-inch overall length, and a 30+1 capacity. It ships with three magazines and weighs 22 oz. The slide is stainless with an Armornite black finish, and the frame is polymer. 
 

Key Specifications 

• Manufacturer: Smith and Wesson 
• Model: M&P 22 Magnum 
• Type: Semi-Auto Pistol 
• Caliber: .22 Magnum (WMR) 
• Barrel Length: 4.35 inches 
• Overall Length: 8.4 inches 
• Capacity: 30 + 1 rounds (ships with three magazines) 
• Weight: 22 oz  
• Finish: Armornite, Black  
• Frame Material: Polymer  
• Slide Material: Stainless Steel  
• Sights: Green Fiber Optic Front, Adjustable Rear  
• Safety Features: Ambi Thumb Safety  
• Additional Info: 
  • Optics Ready Slide 
  • Flat Face Trigger 
  • Locked-Breech TEMPO Barrel 
  • Comes with a Black M&P Logo Bag 
     

Features 

The internal hammer-fired action keeps the profile slim. The green fiber optic front sight and adjustable rear sight pick up targets quickly indoors or outside. The optics-ready slide accepts red dot sights without additional milling, which gives shooters flexibility depending on how they want to run the gun. 
 
At 22 oz, the polymer frame is light enough for long range sessions. The ambidextrous thumb safety works for left- and right-handed shooters. The locked-breech TEMPO barrel is specific to this model and handles the higher pressure of .22 WMR compared to rimfire designs that use blowback operation. The flat-face trigger has a consistent pull. Three 30-round magazines are included.

The S&W M&P 22 Magnum lands well with users who value high-capacity .22 WMR pistols.

Reliability with various .22 WMR loads gets mentioned often. Accuracy is a common positive — most shooters find it performs well at range distances.

The optics-ready slide draws a lot of attention. Shooters who prefer red dots appreciate that it's factory-ready rather than requiring gunsmithing, and several note mounting a red dot improved their target acquisition noticeably.

The 30-round capacity is one of the gun's most discussed specs. It's rare in a .22 WMR pistol, and buyers who want extended range time before reloading specifically seek this out.

The grip and feel come up positively for most shooters, though a segment notes the pistol is bulkier than they expected for a .22 — at 22 oz and 8.4 inches overall, it's on the larger side for the caliber.

Caliber debates are common in the comments. Some shooters prefer .22 LR for lower ammo cost or .22 Mag for terminal performance; each group has their rationale.

Aftermarket support is thinner than for more common handgun platforms, which comes up for buyers who want to customize heavily. Pricing draws some discussion — most find it reasonable given the feature set, but it's not the cheapest way into a .22 WMR handgun.