H&K SP5 & SP5k Forced Reset Trigger Review | War Hammer Armament
Introduction
The MP5 platform has long been one of the most iconic pistol-caliber carbines ever produced. Known for its smooth roller-delayed blowback system and legendary reliability, rifles like the HK SP5 and SP5K remain extremely popular among enthusiasts.
In this video we take a look at these classic MP5 variants equipped with a War Hammer Arms forced reset trigger (FRT). The goal is simple: increase the rate of fire while maintaining the control and reliability the MP5 platform is known for.
If you’re curious whether an FRT trigger is worth adding to an MP5-style firearm, this overview breaks down what you can expect.
Quick Comparison Table
| Platform | Key Feature | Best For | Affiliate |
|---|---|---|---|
| HK SP5 | Full-size MP5 platform | Range & PCC builds | Check Availability |
| HK SP5K | Compact MP5 variant | Compact builds | Check Availability |
| War Hammer Arms FRT | Forced reset trigger | Rapid fire upgrades | Check Availability |
HK SP5 – Classic MP5 Performance
Key Specs
- Caliber: 9mm
- Barrel: 8.9″
- System: Roller-Delayed Blowback
- Origin: Germany
- Platform: MP5 Civilian Variant
The HK SP5 is essentially the civilian version of the legendary MP5 submachine gun. Built around the roller-delayed blowback system, it delivers extremely smooth recoil and exceptional reliability.
When paired with the War Hammer Arms forced reset trigger, the shooting experience becomes dramatically faster while maintaining excellent control.
Pros
- Extremely smooth recoil
- Legendary MP5 reliability
- Very controllable during rapid fire
- High build quality
Cons
- High price compared to clones
- FRT requires practice
HK SP5K – Compact MP5 Variant
Key Specs
- Caliber: 9mm
- Barrel: 5.8″
- System: Roller-Delayed Blowback
- Weight: ~4.2 lbs
- Platform: Compact MP5
The SP5K is the compact version of the MP5 platform. Despite its smaller size, it still uses the same roller-delayed system that makes the MP5 so smooth and reliable.
Adding the War Hammer Arms FRT creates an extremely fast-shooting compact PCC platform.
Pros
- Extremely compact platform
- Very smooth shooting system
- Fast shooting with FRT
- Great for compact builds
Cons
- More muzzle rise than full-size SP5
- Shorter sight radius
War Hammer Arms Forced Reset Trigger
A forced reset trigger uses the bolt movement to mechanically reset the trigger after every shot. This allows extremely fast follow-up shots while still functioning as a semi-automatic trigger.
On the MP5 platform, the smooth roller-delayed system pairs surprisingly well with this type of trigger upgrade.
Pros
- Extremely fast follow-up shots
- Unique shooting experience
- Works well with MP5 recoil system
- Great range upgrade
Cons
- Requires practice
- Not ideal for beginners
- Availability can vary
Final Thoughts
Pairing an MP5 platform like the HK SP5 or SP5K with a forced reset trigger creates a unique shooting experience. The smooth recoil of the roller-delayed system makes it easier to control rapid fire compared to many other PCC platforms.
For enthusiasts looking to upgrade their MP5-style firearm, the War Hammer Arms FRT offers a fun and extremely fast shooting setup.
Frequently Asked Questions
What is a forced reset trigger?
A forced reset trigger mechanically pushes the trigger forward after each shot, allowing faster follow-up shots while remaining semi-automatic.
Does an FRT work well on MP5 platforms?
Yes. The MP5’s roller-delayed system produces very smooth recoil which helps maintain control during rapid fire.
What is the difference between SP5 and SP5K?
The SP5 is the full-size MP5 platform while the SP5K is the shorter compact version designed for smaller builds.
