Polymer80Deals is a Carson City, NV-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, and SP5K platforms. Its ambidextrous design sets it apart from standard triggers. Available now at $713.00, with only one trigger allowed per transaction.
Reviewed by Kyle Brennan, Chief Armorer at Polymer80Deals. 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 |
| Finish | Black oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in design |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.2″ x 0.8″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Key Features
- Ambidextrous design for left or right-handed shooters
- Two-stage operation with three distinct positions
- Precision-machined steel construction for durability
- Drop-in installation for quick setup
- Compatible with HK MP5 series platforms
Who It’s For
Buy it if:
- You own an HK MP5, MP5K, SP5, or SP5K
- You prefer ambidextrous controls
- You want a high-quality, durable trigger
Skip it if:
- You need a trigger for non-MP5 platforms
- You prefer single-stage triggers
- You’re on a tight budget (see our Triggers for alternatives)
Pros & Cons
✅ Ambidextrous design for versatility
✅ Precision CNC machining
✅ Durable steel construction
✅ Drop-in installation
✅ Compatible with multiple HK platforms
❌ Limited to one trigger per transaction
❌ Higher price point (see our Triggers for budget options)
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | Steel | Aluminum | Steel |
| Quality | High | Low | High |
| Compatibility | HK MP5 series | Generic | HK MP5 series |
| Shipping | Same-day | 2-3 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 Polymer80Deals (polymer80deals.com).
Is the FRT-RD3 (AMBI) compatible with all HK MP5 variants?
Yes, it works with HK MP5, MP5K, SP5, and SP5K models.
What is the installation process for the FRT-RD3 (AMBI)?
It features a drop-in design for easy installation.
Is the FRT-RD3 (AMBI) ambidextrous?
Yes, it’s designed for both left and right-handed shooters.
What material is the FRT-RD3 (AMBI) made from?
It’s made from precision-machined steel.
How durable is the FRT-RD3 (AMBI)?
With a hardness of 58-60 HRC, it’s built to last.
Is there a limit on how many FRT-RD3 (AMBI) triggers I can buy?
Yes, only one trigger per transaction.
✅ Same-day shipping from Carson City, NV
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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