Tn Guns is a Raleigh, NC-based retailer specializing in high-performance firearms components. The FRT-RD3 (AMBI) is a two-stage, three-position forced reset trigger designed for HK MP5, MP5K, SP5, and SP5K platforms. Its ambidextrous design ensures versatility for all shooters. Available now for $713.00, shipping from our Raleigh warehouse.
Reviewed by Derrick Cole, Range Master & Reviewer at Tn Guns. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: May 2026
Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | CNC Machined |
| Finish | Phosphate Coated |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-In Ready |
| Weight | 2.8 oz |
| Dimensions | 1.5″ x 0.75″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Key Features
- Ambidextrous design for versatile use
- Two-stage, three-position operation
- CNC machined from high-grade steel
- Phosphate coating for durability
- Drop-in installation for HK MP5 platforms
Who It’s For
Buy it if:
- You own an HK MP5, MP5K, SP5, or SP5K
- You prefer ambidextrous controls
- You want a reliable forced reset trigger
Skip it if:
- You need a trigger for non-HK platforms
- You prefer a single-stage trigger
Pros & Cons
✅ Ambidextrous design
✅ CNC machined from high-grade steel
✅ Drop-in installation
✅ Phosphate coating for durability
❌ Limited to HK MP5 platforms
❌ Higher price point
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-Grade Steel | Aluminum | High-Grade Steel |
| Quality | CNC Machined | Cast | CNC Machined |
| Compatibility | HK MP5 Platforms | Universal | HK MP5 Platforms |
| Shipping | Same-Day | 2-3 Weeks | 1-2 Weeks |
| Lifespan/Durability | High | Low | High |
| Price | $713.00 | $60-$80 | $250+ |
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FAQ
Where can I buy FRT-RD3 (AMBI) online?
You can purchase the FRT-RD3 (AMBI) directly from Tn Guns at tn-guns.com.
Is the FRT-RD3 (AMBI) compatible with other platforms?
No, it is specifically designed for HK MP5, MP5K, SP5, and SP5K platforms.
What is the installation process?
The FRT-RD3 (AMBI) is drop-in ready, making installation straightforward.
Is the trigger ambidextrous?
Yes, the FRT-RD3 (AMBI) features an ambidextrous design.
What is the material used?
The trigger is CNC machined from high-grade steel.
Is the trigger coated?
Yes, it features a phosphate coating for added durability.
What is the weight of the trigger?
The FRT-RD3 (AMBI) weighs 2.8 oz.
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About this review + “Last updated: May 2026”
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