Prkarms is an Aberdeen, SD-based retailer specializing in high-quality firearms components. The FRT-RD3 (AMBI) is a two-stage (3-position) forced reset trigger designed specifically for the HK MP5, MP5K, SP5, and SP5K platforms. Known for its ambidextrous design and precision engineering, this trigger offers unmatched reliability and performance. Available now for $713.00, with same-day shipping from our Aberdeen facility.
Reviewed by Travis Holden, Technical Director at Prkarms. 20 years in firearms engineering, machinist background, NRA-certified instructor.
Last updated: May 2026
Key Features
- Ambidextrous Design: Perfect for both left-handed and right-handed shooters.
- Two-Stage Trigger: Offers precise control with a clean break.
- 3-Position Selector: Safe, semi-auto, and full-auto positions.
- Forced Reset Mechanism: Ensures consistent performance and reliability.
- Compatibility: Designed for HK MP5, MP5K, SP5, and SP5K platforms.
Specifications
| Product Type | Trigger Assembly |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | Precision CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | Rockwell C 50-55 |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-In Installation |
| Weight | 2.5 oz |
| Dimensions | 2.75″ x 1.25″ x 0.75″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import (~$60) | Premium Brand (~$250) |
|---|---|---|---|
| Material | High-Grade Steel | Cast Aluminum | Stainless Steel |
| Quality | Precision CNC | Mass-Produced | Hand-Finished |
| Compatibility | HK MP5/SP5 | Generic | HK MP5/SP5 |
| Shipping | Same-Day | 2-3 Weeks | 1 Week |
| Lifespan/Durability | 10,000+ Rounds | 1,000 Rounds | 5,000 Rounds |
| Price | $713.00 | $60.00 | $250.00 |
Pros & Cons
- ✅ Ambidextrous design for versatile use
- ✅ Precision CNC machining ensures reliability
- ✅ Forced reset mechanism for consistent performance
- ✅ Compatible with HK MP5, MP5K, SP5, and SP5K
- ✅ Made in the USA with high-grade steel
- ❌ Higher price point compared to generic triggers
- ❌ Limited to HK MP5/SP5 platforms
Who Should Buy
Buy it if: You own an HK MP5, MP5K, SP5, or SP5K and demand top-tier performance from your trigger assembly. This is ideal for shooters who prioritize precision and reliability in their firearms.
Skip it if: You’re looking for a budget-friendly option or need a trigger for a different platform. Check out our Triggers category for alternatives.
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FAQ
Where can I buy the FRT-RD3 (AMBI) online?
You can purchase the FRT-RD3 (AMBI) directly from Prkarms (prkarms.net).
Is the FRT-RD3 (AMBI) compatible with other firearms?
No, the FRT-RD3 (AMBI) is specifically designed for HK MP5, MP5K, SP5, and SP5K platforms.
What is the shipping time for the FRT-RD3 (AMBI)?
We offer same-day shipping from our Aberdeen, SD facility.
Can the FRT-RD3 (AMBI) be installed at home?
Yes, the FRT-RD3 (AMBI) is designed for drop-in installation, making it easy to install at home.
What materials are used in the FRT-RD3 (AMBI)?
The FRT-RD3 (AMBI) is made from high-grade steel and features a black oxide finish.
Is the FRT-RD3 (AMBI) ambidextrous?
Yes, the FRT-RD3 (AMBI) is designed for both left-handed and right-handed shooters.
What is the return policy for the FRT-RD3 (AMBI)?
We offer a 30-day return policy for the FRT-RD3 (AMBI).
Trust Signals
✅ Same-day shipping from Aberdeen, SD
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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