The HK MP5 in .22 LR is a semi-automatic rimfire rifle styled after the original MP5 submachine gun. With a 16.1-inch barrel, 25-round capacity, and 7 lb weight, it's oriented toward range use, training, and recreational shooting. 
 

Key Specifications 

• Caliber: .22 LR 
• Action: Semi-Automatic 
• Capacity: 25 Rounds (+1) 
• Barrel Length: 16.1 inches 
• Weight: 7 lbs. 
• Finish: Black 
   

Detailed Features 

The adjustable flip-up sights give you two aperture options without tools. The retractable stock adjusts to fit different shooters or storage needs. The single-stage trigger has a smooth pull that works well for fast follow-up shots, and the safety selector is positive and easy to reach. 
 
The .22 LR chambering keeps ammunition costs low and recoil minimal, which makes extended range sessions practical. The iconic MP5 profile is also a draw for collectors and enthusiasts who want the look and manual of arms of the original in a rimfire package.

The HK MP5 .22 LR draws predictable reactions: enthusiasts like it for what it is, and practical-minded buyers sometimes balk at the price.

Build quality is frequently praised. The rifle feels solid and the controls are laid out the same as a centerfire MP5, which is the point for anyone using it as a training tool. The .22 LR caliber makes it cheap to run and easy on new shooters. Accuracy is reported as good enough for casual target work.

The criticisms that come up repeatedly: weight (7 lbs is on the heavy side for a .22), price (HK commands a premium that's hard to justify purely on ballistics when .22 LR options exist at half the cost), and occasional magazine feeding reliability. Aftermarket support is limited compared to more common .22 platforms.

For someone who wants to run MP5 controls and drills without centerfire ammo cost, the value proposition is clear. For a buyer who just wants an affordable plinker, there are better options at lower price points.