Description
Glockselectfire is a Fargo, ND-based retailer specializing in high-performance firearms accessories. The FRT-RD3 (SEF) is a two-stage, three-position forced reset trigger designed for HK MP5, MP5K, SP5, and SP5K platforms. Its precision engineering ensures reliable performance under rigorous conditions. Available now for $707.25, with only one trigger per transaction.
Reviewed by Derrick Cole, Range Master & Reviewer at Glockselectfire. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Steel |
| Manufacturing | CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Professional Installation Recommended |
| Weight | 3.2 oz |
| Dimensions | 1.5″ x 0.75″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-SEF |
Key Features
- Two-stage trigger mechanism for enhanced control
- Three-position selector for versatility
- CNC machined steel construction for durability
- Black oxide finish for corrosion resistance
- Compatible with HK MP5 series firearms
Who It’s For
Buy it if: You own an HK MP5, MP5K, SP5, or SP5K and want a reliable, high-performance trigger upgrade. This is ideal for competitive shooters and enthusiasts who demand precision.
Skip it if: You’re looking for a budget option or don’t need a forced reset trigger. Check out our Triggers category for alternatives.
Pros & Cons
- ✅ Precision-engineered for consistent performance
- ✅ Durable steel construction
- ✅ Three-position selector for versatility
- ✅ Compatible with HK MP5 series
- ✅ Black oxide finish for corrosion resistance
- ❌ Higher price point compared to basic triggers
- ❌ Professional installation recommended
Comparison
| Feature | FRT-RD3 (SEF) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | Steel | Aluminum | Steel |
| Quality | High | Low | High |
| Compatibility | HK MP5 Series | Generic | HK MP5 Series |
| Shipping | Same-day | 2-3 Weeks | 1 Week |
| Lifespan | Long | Short | Long |
| Price | $707.25 | $70 | $250+ |
FAQ
What does SEF stand for?
SEF stands for Safe, Einzelfeuer (Semi-Auto), Feuerstoß (Full-Auto), which are the three positions on the trigger selector.
Is the FRT-RD3 (SEF) compatible with all HK MP5 models?
Yes, it is compatible with HK MP5, MP5K, SP5, and SP5K models.
Where can I buy the FRT-RD3 (SEF) online?
You can purchase the FRT-RD3 (SEF) at Glockselectfire.com.
What is the penalty for non-compliance of FEMA regulations?
Non-compliance with FEMA regulations can result in fines or legal action, depending on the severity of the violation.
What are the SEF requirements?
The SEF requirements include proper installation and adherence to local firearms regulations.
Is professional installation required?
While not mandatory, professional installation is recommended to ensure optimal performance and safety.
What is the warranty on the FRT-RD3 (SEF)?
The FRT-RD3 (SEF) comes with a 30-day return policy and a limited warranty against manufacturing defects.
✅ Same-day shipping from Fargo, ND
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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