Polymer80Buy is a Rock Springs, WY-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. Known for its precision engineering and ambidextrous design, this trigger enhances your shooting experience. Available now for $713.00.
Reviewed by Marcus Webb, Founder & Lead Builder at Polymer80Buy. 14 years in the P80/Glock aftermarket, 3,000+ kits shipped.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | CNC Machined |
| Finish | Matte Black |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-In |
| Weight | 2.5 oz |
| Dimensions | 2.75″ x 1″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Key Features
- Ambidextrous design for left- and right-handed shooters
- Two-stage trigger with three positions
- Precision CNC machining ensures reliability
- Matte black finish for durability and aesthetics
- Drop-in installation for quick setup
Who It’s For
Buy it if:
- You own an HK MP5, MP5K, SP5, or SP5K
- You want a high-performance forced reset trigger
- You prefer an ambidextrous design
Skip it if:
- You don’t own a compatible firearm
- You’re looking for a budget-friendly option
Pros & Cons
✅ Ambidextrous design
✅ Precision CNC machining
✅ Drop-in installation
✅ Durable matte black finish
❌ Higher price point
❌ Limited compatibility
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-Grade Steel | Low-Grade Steel | High-Grade Steel |
| Quality | Precision CNC | Basic CNC | Precision CNC |
| Compatibility | HK MP5 Series | Limited | HK MP5 Series |
| Shipping | Same-Day | 1-2 Weeks | 1 Week |
| Lifespan | Long | Short | Long |
| Price | $713.00 | $60-80 | $250+ |
FAQ
Where can I buy FRT-RD3 (AMBI) online?
You can purchase the FRT-RD3 (AMBI) at Polymer80Buy (polymer80buy.com).
Is the FRT-RD3 (AMBI) easy to install?
Yes, it features a drop-in design for quick and easy installation.
What firearms are compatible with the FRT-RD3 (AMBI)?
It is compatible with HK MP5, MP5K, SP5, and SP5K.
Is the FRT-RD3 (AMBI) ambidextrous?
Yes, it is designed for both left- and right-handed shooters.
What is the material of the FRT-RD3 (AMBI)?
It is made from high-grade steel for durability and reliability.
Does the FRT-RD3 (AMBI) come with a warranty?
Please contact us for warranty information.
What is the shipping time for the FRT-RD3 (AMBI)?
We offer same-day shipping from Rock Springs, WY.
✅ Same-day shipping from Rock Springs, WY
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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