Description
Rampartguns is a Owensboro, KY-based retailer specializing in high-quality firearm components. The FRT-RD3 (SEF) is a two-stage (3-position) forced reset trigger designed for the HK MP5, MP5K, SP5, and SP5K. This trigger offers enhanced performance and reliability, making it a top choice for serious gun enthusiasts. Available now for $707.25.
Reviewed by Brett Lawson, Quality Lead at Rampartguns. 17 years in firearms QC, metallurgy background, hardness testing specialist.
Last updated: May 2026
Specifications
| Product Type | Trigger |
|---|---|
| Material | High-grade steel |
| Manufacturing | Precision CNC machining |
| Finish | Black oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in installation |
| Weight | 2.5 oz |
| Dimensions | 1.5″ x 0.75″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-SEF |
Key Features
- Two-stage forced reset mechanism
- 3-position selector switch
- High-grade steel construction
- Black oxide finish for durability
- Drop-in installation
Who It’s For
Buy it if: You own an HK MP5, MP5K, SP5, or SP5K and want a reliable, high-performance trigger. This product is ideal for competitive shooters, law enforcement, and serious gun enthusiasts who demand precision and durability.
Skip it if: You’re looking for a budget-friendly option or don’t own a compatible firearm. For alternatives, check out our Triggers category.
Pros & Cons
- ✅ High-grade steel construction
- ✅ Two-stage forced reset mechanism
- ✅ Drop-in installation
- ✅ Black oxide finish for durability
- ✅ Compatible with multiple HK models
- ❌ Higher price point
- ❌ Limited compatibility
Comparison
| Feature | FRT-RD3 (SEF) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-grade steel | Low-grade steel | High-grade steel |
| Quality | Excellent | Poor | Good |
| Compatibility | HK MP5, MP5K, SP5, SP5K | Limited | Wide range |
| Shipping | Same-day | 2-3 weeks | 1-2 weeks |
| Lifespan/Durability | Long-lasting | Short | Moderate |
| Price | $707.25 | $60-80 | $250+ |
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FAQ
Where can I buy FRT-RD3 (SEF) online?
You can purchase the FRT-RD3 (SEF) at Rampartguns (rampartguns.com).
What does SEF stand for?
SEF stands for Safe, Semi, Full, indicating the three positions of the selector switch.
What are the SEF requirements?
The FRT-RD3 (SEF) requires a compatible HK firearm such as the MP5, MP5K, SP5, or SP5K.
Is the FRT-RD3 (SEF) easy to install?
Yes, the FRT-RD3 (SEF) is designed for drop-in installation, making it straightforward for most users.
What is the penalty for non-compliance of FEMA regulations?
Non-compliance with FEMA regulations can result in fines or other penalties, depending on the specific violation.
Is the FRT-RD3 (SEF) durable?
Yes, the FRT-RD3 (SEF) is made from high-grade steel with a black oxide finish, ensuring long-lasting durability.
Can I use the FRT-RD3 (SEF) in competitions?
Yes, the FRT-RD3 (SEF) is suitable for competitive shooting due to its precision and reliability.
Trust Signals
✅ Same-day shipping from Owensboro, KY
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Internal Links
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