The HK SP5K-PDW is a semi-automatic 9mm pistol built on HK's MP5 platform. It has a 5.83" barrel, measures 13.80" overall, weighs 4.20 lbs, and ships with two OEM magazines at 10+1 capacity. The frame is black polymer with an aluminum receiver. This is the civilian semi-auto version of HK's submachine gun lineage, not a full-auto NFA item. 
 

Key Specifications 

• Model: SP5K-PDW 
• Caliber: 9mm Luger 
• Action: Semi-Auto 
• Capacity: 10+1 rounds 
• Barrel Length: 5.83 inches 
• Overall Length: 13.80 inches 
• Weight: 4.20 lbs 
• Finish: Black 
• Grip Material: Black Polymer 
• Includes: Two OEM magazines 
   

Features 

The SP5K-PDW uses the roller-delayed blowback action from the MP5 family, which contributes to smooth cycling and manageable felt recoil for a 9mm pistol. The polymer frame keeps the overall weight down to 4.20 lbs. Controls are laid out in HK's familiar arrangement: paddle magazine release, ambidextrous safety. The accessory rail accepts lights and optics. At 13.80" OAL, it's compact enough to transport easily but requires a holster designed for this footprint. 
 
The 5.83" barrel gives a velocity advantage over shorter 9mm pistols and a longer sight radius if using the iron sights. The aluminum receiver is built to the same tolerances as HK's commercial and government-supply production. 
 

Typical Uses 

• Competitive PCC-adjacent shooting and range work 
• Collectors who want the MP5-style platform in a legal semi-auto pistol configuration 
• Tactical training where the roller-delayed action and controls are the point

The SP5K-PDW draws genuine enthusiasm from HK fans and MP5 platform devotees. Build quality gets consistent praise — owners describe it as tight-fitting and well-finished, which is typical of what HK commands at this price point. Reliability across different 9mm loads is a common positive, with few cycling issues reported.

Ergonomics tend to land well with users familiar with the MP5 control layout. The paddle mag release and overall handling get positive comments, though shooters coming from modern pistols sometimes need a short adjustment period.

The price is the most common source of hesitation. At its retail tier, the SP5K-PDW costs significantly more than comparable 9mm pistols, which sparks debate about whether the platform premium is worth it. Most buyers who committed to the purchase are satisfied, viewing the cost as reasonable for HK production quality. Aftermarket support is more limited than for mainstream pistol platforms, which some owners note as a limitation for customization.