Polymer80Market is a Twin Falls, ID-based retailer specializing in premium aftermarket firearm parts. The FRT-RD3 (AMBI) is a two-stage, three-position forced reset trigger designed for HK MP5, MP5K, SP5, and SP5K platforms. Its ambidextrous design ensures versatility for both left- and right-handed shooters. Available now for $713.0, with only one trigger per transaction.
Reviewed by Tyler Nash, Product Curator at Polymer80Market. 13 years selecting and testing aftermarket Glock parts, reviews editor.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Steel |
| Manufacturing | CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | High-Grade Steel |
| 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 universal use
- Two-stage, three-position functionality
- Precision CNC machining for reliability
- Black oxide finish for durability
- Drop-in installation for easy setup
Who It’s For
Buy it if: You’re a serious shooter looking for a high-performance forced reset trigger for your HK MP5 or SP5 platform. This is ideal for enthusiasts who prioritize precision and versatility.
Skip it if: You’re on a tight budget or need a basic trigger for casual use. Check out our Triggers Category for more affordable options.
Pros & Cons
- ✅ Ambidextrous design for all users
- ✅ Precision CNC machining ensures reliability
- ✅ Drop-in installation saves time
- ✅ Black oxide finish resists wear
- ✅ Compatible with multiple HK platforms
- ❌ Higher price point compared to basic triggers
- ❌ Limited to one per transaction
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import Trigger | Premium Brand Trigger |
|---|---|---|---|
| Material | Steel | Aluminum | Steel |
| Quality | High-Grade | Low | Medium |
| Compatibility | HK MP5, SP5 | Generic | Specific Models |
| Shipping | Same-Day | 2-4 Weeks | 1 Week |
| Lifespan | Durable | Short | Moderate |
| Price | $713.0 | $60-80 | $250+ |
FAQ
Where can I buy FRT-RD3 (AMBI) online?
Polymer80Market (polymer80market.com) offers the FRT-RD3 (AMBI) with same-day shipping from Twin Falls, ID.
Is the FRT-RD3 (AMBI) compatible with HK SP5?
Yes, the FRT-RD3 (AMBI) is designed for HK MP5, MP5K, SP5, and SP5K platforms.
What is the installation process?
The FRT-RD3 (AMBI) features drop-in installation for quick and easy setup.
Is this trigger ambidextrous?
Yes, the FRT-RD3 (AMBI) is designed for both left- and right-handed shooters.
What is the return policy?
Polymer80Market offers a 30-day return policy on the FRT-RD3 (AMBI).
Is this product in stock?
Yes, the FRT-RD3 (AMBI) is in stock and ready to ship today.
Can I buy more than one?
No, only one FRT-RD3 (AMBI) per transaction is allowed.
✅ Same-day shipping from Twin Falls, ID
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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