Polymer80Outlet is a Duluth, MN-based retailer specializing in high-performance firearm components. The FRT-RD3 (AMBI) is a two-stage (3-position) forced reset trigger designed for the HK MP5, MP5K, SP5, and SP5K. This ambidextrous model offers enhanced control and precision. Available now at $713.00 with same-day shipping.
Reviewed by Travis Holden, Technical Director at Polymer80Outlet. 20 years in firearms engineering, machinist background, NRA-certified instructor.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Aircraft-grade aluminum |
| Manufacturing | CNC machined |
| Finish | Hard coat anodized |
| Hardness/Quality | Rockwell C50 |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in |
| Weight | 2.8 oz |
| Dimensions | 2.5″ x 1″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Key Features
- Two-stage forced reset mechanism
- Ambidextrous design for left or right-handed shooters
- Precision CNC machining for consistent performance
- Hard coat anodized finish for durability
- Drop-in installation with no gunsmithing required
Who It’s For
Buy it if: You own an HK MP5, MP5K, SP5, or SP5K and want a high-performance trigger with ambidextrous functionality.
Skip it if: You’re looking for a budget-friendly option or don’t require ambidextrous controls. Check out our Triggers category for alternatives.
Pros & Cons
- ✅ Ambidextrous design enhances versatility
- ✅ Precision CNC machining ensures reliability
- ✅ Drop-in installation saves time
- ✅ Hard coat anodized finish resists wear
- ✅ Compatible with multiple HK models
- ❌ Higher price point compared to basic triggers
- ❌ Limited to HK MP5 series platforms
Comparison
| Feature | FRT-RD3 (AMBI) | Budget Import | Premium Brand |
|---|---|---|---|
| Material | Aircraft-grade aluminum | Cast aluminum | Forged steel |
| Quality | CNC machined | Die cast | CNC machined |
| Compatibility | HK MP5 series | Generic | Specific models |
| Shipping | Same-day | 2-3 weeks | 1 week |
| Lifespan | 50,000+ rounds | 10,000 rounds | 50,000+ rounds |
| Price | $713.00 | $60-80 | $250+ |
FAQ
Where can I buy the FRT-RD3 (AMBI) online?
You can purchase the FRT-RD3 (AMBI) directly from Polymer80Outlet at polymer80outlet.com.
Is the FRT-RD3 (AMBI) compatible with other firearms?
No, it is specifically designed for HK MP5, MP5K, SP5, and SP5K models.
Does the FRT-RD3 (AMBI) require gunsmithing?
No, it features a drop-in design for easy installation.
What is the warranty on the FRT-RD3 (AMBI)?
It comes with a 1-year manufacturer warranty.
Can I return the FRT-RD3 (AMBI) if I’m not satisfied?
Yes, Polymer80Outlet offers a 30-day return policy.
Is the FRT-RD3 (AMBI) legal in my state?
Please check your local laws and regulations before purchasing.
How does the FRT-RD3 (AMBI) compare to other triggers?
It offers superior precision and durability compared to budget options, with ambidextrous functionality.
✅ Same-day shipping from Duluth, MN
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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