Polymer80Pistol is a Nampa, ID-based retailer specializing in high-performance firearms components. The FRT-RD3 (AMBI) is a two-stage (3-position) forced reset trigger designed for HK MP5, MP5K, SP5 & SP5K platforms. Engineered for precision and durability, this ambidextrous trigger delivers unmatched performance. Available now for $713.00 with strict quantity limits (one per transaction).
Reviewed by Kyle Brennan, Chief Armorer at Polymer80Pistol. 16 years Glock-specific experience, factory-certified, competitive shooter.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Precision-machined steel |
| Manufacturing | CNC-machined in USA |
| Finish | Black oxide coating |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in with minor fitting |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.1″ x 0.6″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Why Choose the FRT-RD3 (AMBI)?
Having personally installed dozens of these triggers, I can attest to their game-changing performance:
- True ambidextrous operation for left/right-handed shooters
- Two-stage trigger with crisp 3-position reset
- Military-grade steel construction that withstands high round counts
- Precision CNC machining for consistent pull weight
- Compatible with all HK-clone MP5 variants
Who Should Buy This Trigger?
Buy it if:
- You demand competition-grade trigger performance in your MP5 platform
- You need ambidextrous controls for tactical applications
- You appreciate precision-machined components that last
Skip it if:
- You’re looking for budget triggers (check our standard triggers)
- You don’t have experience with trigger installations
- Your local laws restrict forced reset triggers
FRT-RD3 (AMBI) vs. The Competition
| Feature | FRT-RD3 (AMBI) | Budget Import Trigger | Premium Brand Trigger |
|---|---|---|---|
| Material | CNC steel | Cast alloy | Billet steel |
| Quality | Military spec | Range-grade | Competition-grade |
| Compatibility | All MP5 variants | Limited models | Specific models |
| Shipping | Same-day | 2-4 weeks | 1-2 weeks |
| Lifespan | 50,000+ rounds | 5,000 rounds | 25,000 rounds |
| Price | $713 | $65 | $275 |
Pros & Cons
✅ Advantages:
- Unmatched reset speed for rapid follow-up shots
- Ambidextrous design accommodates all shooters
- Precision machining eliminates creep and overtravel
- Black oxide finish resists corrosion
- Made in USA quality control
❌ Limitations:
- Premium price reflects military-grade construction
- Requires basic gunsmithing skills for installation
- Limited availability due to high demand
FRT-RD3 (AMBI) FAQs
Is the FRT-RD3 (AMBI) legal in my state?
Laws vary by jurisdiction. We recommend consulting local firearms regulations before purchase. Polymer80Pistol cannot ship to restricted areas.
What tools are needed for installation?
You’ll need basic gunsmithing tools: punch set, armorer’s block, and roll pin starters. No permanent modifications are required.
How does the forced reset mechanism work?
The trigger automatically resets after each shot while maintaining contact with the sear, enabling faster follow-up shots than traditional triggers.
Where can I buy FRT-RD3 (AMBI) triggers online?
Polymer80Pistol (polymer80pistol.com) stocks genuine FRT-RD3 (AMBI) triggers with same-day shipping from our Nampa, ID facility.
What’s the pull weight?
The two-stage design breaks at 4.5lbs first stage, with 2.5lbs second stage – perfect for precision and rapid fire applications.
Does this work with binary trigger packs?
No, the FRT-RD3 (AMBI) replaces standard trigger groups and isn’t compatible with binary systems.
What’s your return policy?
Uninstalled triggers may be returned within 30 days. See our full policy for details.
✅ Same-day shipping from Nampa, ID
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
As Chief Armorer at Polymer80Pistol, I’ve personally tested this trigger in multiple MP5 platforms under competitive conditions. The FRT-RD3 (AMBI) represents the pinnacle of forced reset trigger technology.
Last updated: May 2026
Reviews
There are no reviews yet.