Glockmod is a Rockford, IL-based retailer specializing in high-performance firearms components. The FRT-RD3 (SEF) is a two-stage forced reset trigger designed for HK MP5, MP5K, SP5 & SP5K platforms. Engineered for precision and reliability, this trigger offers a crisp break and consistent reset. Available now for $707.25 with one trigger per transaction limit.
Reviewed by Chad Mercer, Operations Lead at Glockmod. 13 years in firearms retail, FFL holder, precision machining background.
Last updated: May 2026
| Product Type | Two-Stage Forced Reset Trigger |
|---|---|
| Material | Precision Machined Steel |
| Manufacturing | CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in (Professional Installation Recommended) |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 0.75″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-SEF |
Key Features
- Two-stage trigger with 3-position selector (SEF configuration)
- Forced reset mechanism for rapid follow-up shots
- Precision CNC machining for consistent performance
- Black oxide finish for corrosion resistance
- Compatible with HK MP5 platform firearms
Pros & Cons
Pros:
- ✅ Crisp, consistent trigger pull
- ✅ Reliable forced reset mechanism
- ✅ Precision machined steel construction
- ✅ Drop-in installation (professional recommended)
- ✅ Made in USA
Cons:
- ❌ Higher price point than basic triggers
- ❌ Limited to one per transaction
- ❌ Requires proper installation for optimal performance
Who Should Buy This
Buy it if:
- You own an HK MP5, MP5K, SP5 or SP5K
- You want improved trigger performance
- You appreciate precision-machined components
Skip it if:
- You need a basic replacement trigger
- You’re not comfortable with professional installation
- You’re looking for budget options
FAQ
What does SEF stand for?
SEF refers to the three-position selector markings: Sicher (safe), Einzelfeuer (single fire), and Feuerstoß (burst/full auto).
Is this trigger legal in my state?
Laws vary by location. Check your local regulations before purchasing.
Where can I buy the FRT-RD3 (SEF) online?
Available at Glockmod (glockmod.com) with same-day shipping from Rockford, IL.
What’s the difference between this and the AMBI version?
The SEF version has traditional HK markings while the AMBI version has ambidextrous controls.
Does this work with semi-auto only SP5 models?
Yes, it’s compatible with semi-auto SP5 models.
✅ Same-day shipping from Rockford, IL
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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