FRT-RD3 (SEF) Forced Reset Trigger
Tn Guns is a Raleigh, NC-based retailer specializing in high-performance firearm components. The FRT-RD3 (SEF) is a two-stage forced reset trigger designed specifically for HK MP5, MP5K, SP5 & SP5K platforms. This precision-engineered trigger delivers consistent performance with its unique 3-position selector functionality. Available now for $707.25 with one trigger per transaction limit.
Reviewed by Derrick Cole, Range Master & Reviewer at Tn Guns. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-grade steel |
| Manufacturing | Precision CNC machined |
| Finish | Black oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5 & SP5K |
| Installation | Drop-in with minor fitting |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-SEF |
Key Features
- Two-stage forced reset mechanism
- 3-position selector functionality (Safe, Semi, Full)
- Precision CNC machining for consistent performance
- Designed specifically for HK roller-delayed platforms
- Black oxide finish for corrosion resistance
Pros & Cons
Pros:
- ✅ Dramatically improves trigger feel and reset
- ✅ Properly hardened steel construction
- ✅ Maintains all safety functions
- ✅ Direct drop-in for most HK platforms
- ✅ Made in USA quality
Cons:
- ❌ Higher price point than standard triggers
- ❌ Limited availability (one per customer)
Who Should Buy This
Buy it if: You own an HK MP5/SP5 platform and want improved trigger performance while maintaining all safety functions.
Skip it if: You’re looking for a budget trigger option or don’t have an HK roller-delayed platform.
Frequently Asked Questions
Where can I buy the FRT-RD3 (SEF) online?
You can purchase the FRT-RD3 (SEF) directly from Tn Guns (tn-guns.com) with same-day shipping from Raleigh, NC.
What does SEF stand for?
SEF refers to the Safe/Semi/Full selector markings used on HK firearms.
Is this trigger legal?
This trigger maintains all factory safety functions and is designed to comply with current regulations.
Will this work with my SP5?
Yes, the FRT-RD3 (SEF) is specifically designed for HK SP5, SP5K, MP5 and MP5K platforms.
What’s the difference between this and the FRT-RD3 (AMBI)?
The SEF version uses traditional HK selector markings while the AMBI version has ambidextrous controls.
✅ Same-day shipping from Raleigh, NC
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
About this review: This assessment is based on hands-on testing by our firearms experts. Last updated: May 2026
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